Accept strings as well as Label objects (#202)

This should be more generic, but it's a wig work to do it
everywhere. Let's keep that in mind for V2.
Acknowledge lack of test coverage in the old Download API
Implement equality comparison of CompletableGithubObject (#201)
Add 'author' to 'Repository.get_commits' (#204)
Push to master to reset statistics
Fix tests broken by previous commit
Fix doc
First step of implementation of Repository.get_stats_xxx (#203)
Fix copyright headers
Finish .../stats/... (#203)
Fix tests for Python 2.5 and 2.6
Update readme for #203
Merge branch 'develop'
Publish version 1.21.0
Add initial version of getemojis
Added 'stargazers_count' property to Repository
Add /user/teams (GET)
Merge branch 'pr212' into develop
Merge branch 'pr213' into develop
Remove Python 2.5 which seems broken on Travis

https://travis-ci.org/jacquev6/PyGithub/jobs/15501387