Systematic license information for all web pages and contributions

[rlaemmel]

cc @sschauss
cc @johanneshaertel

Basically, we need to do more or less exactly the same thing for MetaLib as for 101:

101companies/101rails#197

In summary (as a checklist):

• Add LICENSE file to metalib repo with enough information about CC Attribution 4.0
• Make license/copyright information appear at the bottom of each page.
• I guess we link to the license file to have people discover more information about CC A 4.0.

[le-cram]

Is this done?

[kevin-klein]

i talked to @rlaemmel and we agreed that we use MIT License for code as CC A 4.0 does not cover things like linking and binary artifacts. For 101wiki we went with MIT for code and CC A 4.0 for the wiki content. Should we do it the same?

[rlaemmel]

We could possibly apply MIT also to the models of metalib because it is highly structured "code".
What do you guys think?

[kevin-klein]

i think it would be a good idea.