update octokit dependency
update changelog and version
Use ruby 1.9 hash syntax
Update example app to work with new octokit

Basically, all fields of a GitHub API response that end in _url have to
be accessed as follows:

Given a field named foo_url, to get its content you write
obj.rels[:foo].href instead of obj.foo_url.
No longer perform CI on ruby 1.8
Test against rails 4.0.0, not 4.0.0.pre
Don't test against rails 4 on ruby 1.9.2
Make example app start with rails 4
Improve README

- fix outdated urls
- fix code example errors
- add section on how to get example app up
Merge branch 'release-1.1'