Update to work with the latest crates

[panicbit]

This change is 

[illegalprime]

I like this refactor 👍

[illegalprime]

Hi @panicbit thanks for the PR!
I will take a longer look at it soon, can you tell me why you thought to switch to hyper?

[panicbit]

I decided to switch to hyper to get rid of the dependency on curl, though, it turns out to probably not be worth it. A lot of the Request/Url caching got lost in the process 😞 . I should probably rebase and single out the non-hyper changes.

[illegalprime]

It is because curl is not compatible with Windows? I remember some trouble with that.
Anyway will take a look soon, I totally forgot why Arc had to be there, but I'm glad to see it gone.

[panicbit]

I'm not using Windows primarily but AFAIK setting up native dependencies is a pain.

[illegalprime]

Oh so we shouldn't depend on libcurl? That makes sense.

[panicbit]

I'm not saying that you shouldn't, but I guess it would be nice to gradually move towards pure Rust crates. Hyper sadly still has a dependency on openssl.

[illegalprime]

You're right that pure rust crates are ideal, I'll think about it and get back to you.

[illegalprime]

This is good too!

[phrohdoh]

I cannot build this.

tmba:rust-firebase thill $ cargo build
    Updating registry `https://github.com/rust-lang/crates.io-index`
 Downloading hyper v0.9.10
 Downloading language-tags v0.2.2
 Downloading httparse v1.1.2
 Downloading cookie v0.2.5
 Downloading typeable v0.1.2
 Downloading openssl-verify v0.1.0
 Downloading num_cpus v0.2.13
 Downloading mime v0.2.2
 Downloading traitobject v0.0.1
 Downloading openssl v0.7.14
 Downloading solicit v0.4.4
 Downloading unicase v1.4.0
 Downloading openssl-sys-extras v0.7.14
 Downloading openssl-sys v0.7.17
 Downloading hpack v0.2.0
 Downloading rustc_version v0.1.7
 Downloading semver v0.1.20
   Compiling log v0.3.6
   Compiling lazy_static v0.2.1
   Compiling bitflags v0.7.0
   Compiling libc v0.2.16
   Compiling httparse v1.1.2
   Compiling gcc v0.3.35
   Compiling semver v0.1.20
   Compiling unicode-normalization v0.1.2
   Compiling num_cpus v0.2.13
   Compiling mime v0.2.2
   Compiling pkg-config v0.3.8
   Compiling openssl v0.7.14
   Compiling language-tags v0.2.2
   Compiling hpack v0.2.0
   Compiling rustc_version v0.1.7
   Compiling openssl-sys v0.7.17
   Compiling unicase v1.4.0
   Compiling winapi-build v0.1.1
   Compiling traitobject v0.0.1
   Compiling solicit v0.4.4
Build failed, waiting for other jobs to finish...
error: failed to run custom build command for `openssl v0.7.14`
process didn't exit successfully: `/Users/thill/projects/play/rust/rust-firebase/target/debug/build/openssl-5464f8f6e728c35a/build-script-build` (exit code: 101)
--- stdout
TARGET = Some("x86_64-apple-darwin")
OPT_LEVEL = Some("0")
PROFILE = Some("debug")
TARGET = Some("x86_64-apple-darwin")
debug=true opt-level=0
HOST = Some("x86_64-apple-darwin")
TARGET = Some("x86_64-apple-darwin")
TARGET = Some("x86_64-apple-darwin")
HOST = Some("x86_64-apple-darwin")
CC_x86_64-apple-darwin = None
CC_x86_64_apple_darwin = None
HOST_CC = None
CC = None
HOST = Some("x86_64-apple-darwin")
TARGET = Some("x86_64-apple-darwin")
HOST = Some("x86_64-apple-darwin")
CFLAGS_x86_64-apple-darwin = None
CFLAGS_x86_64_apple_darwin = None
HOST_CFLAGS = None
CFLAGS = None
running: "cc" "-O0" "-ffunction-sections" "-fdata-sections" "-g" "-m64" "-fPIC" "-o" "/Users/thill/projects/play/rust/rust-firebase/target/debug/build/openssl-5464f8f6e728c35a/out/src/c_helpers.o" "-c" "src/c_helpers.c"
cargo:warning=src/c_helpers.c:1:10: fatal error: 'openssl/ssl.h' file not found
cargo:warning=#include <openssl/ssl.h>
cargo:warning=         ^
cargo:warning=1 error generated.
ExitStatus(ExitStatus(256))


command did not execute successfully, got: exit code: 1



--- stderr
thread 'main' panicked at 'explicit panic', /Users/thill/.cargo/registry/src/github.com-1ecc6299db9ec823/gcc-0.3.35/src/lib.rs:897
stack backtrace:
   1:        0x10270c969 - std::sys::backtrace::tracing::imp::write::h29f5fdb9fc0a7395
   2:        0x102712c70 - std::panicking::default_hook::_{{closure}}::h2cc84f0378700526
   3:        0x102711f94 - std::panicking::default_hook::hbbe7fa36a995aca0
   4:        0x102712582 - std::panicking::rust_panic_with_hook::h105c3d42fcd2fb5e
   5:        0x1026e2807 - std::panicking::begin_panic::h5c54e97e5cda1cc4
   6:        0x1026fd824 - gcc::fail::h61b641a0af002bb7
   7:        0x1026fd45e - gcc::run::hbeab7a383c7357cf
   8:        0x1026f6f42 - gcc::Config::compile_object::he1280a23d2ea58fb
   9:        0x1026f68b9 - gcc::Config::compile_objects::hdb20fd8be1b6199c
  10:        0x1026f5e90 - gcc::Config::compile::h8371c79ea2fe64ff
  11:        0x1026dad62 - build_script_build::main::he5071e1b00fcfe0e
  12:        0x10271223c - std::panicking::try::call::h5df3ac2979db3c90
  13:        0x10271325a - __rust_maybe_catch_panic
  14:        0x102711a4d - std::rt::lang_start::hfe9ab243c60ffb9b
  15:        0x1026daf29 - main

[nelsonjchen]

For my own crate, I've switched to using reqwest. That may not be applicable here but I did it to use its default of using native-tls. That's the kind of stuff that'll knock off the OpenSSL error on the Mac. I don't recall that really existing at the start of this PR or the post above.