Added method to accomplish registration functionality#1

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v2Nitesh wants to merge 4 commits intoActiveStack:masterfrom

NiteshMeshram:registration_feature

Commits on May 27, 2016

Commits on May 31, 2016

Modified Podspec
v2Nitesh
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Commits on Jun 8, 2016

1. Added Registration logic PFClient & PFAuthManager ActiveStack iOS SDK 2. Tested the with local server both the Registration.
v2Nitesh
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