Github.get_hook (#196)
Fix typo
Use ValuedAttribute and NotSet.value (preparation for #195)
Factorize the creation of attributes (preparation for #195)
Factorize
Raise exception only when user *accesses* an attribute with a bad value (#195)
Merge branch 'topic/RaiseLaterInCaseOfBadData' into develop
Fix (?) Travis for Python 2.5 and 2.6
Fix public/private in Repository.edit (#199)
Remove Repository.create_download and NamedUser.create_gist
Update the list of unsupported APIs

We have some work to do!
Remove dead link (#198)
Add a link to DevAssistant (#197)
Remove tests for deleted methods!
Merge branch 'develop'
Publish version 1.20.0