Add 'dynamic favicon' setting
extra spec
Add onebox for GitHub pull requests
Extract callbacks and validations for Post

Move Post create callbacks to PostCreate
Extract Post validations
Move stripped_length_validator to lib/validators
Merge branch 'master' of github.com:discourse/discourse
Merge pull request #991 from chrishunt/add-pull-request-onebox

Add onebox for GitHub pull requests
Merge pull request #988 from chrishunt/add-dynamic-favicon

Add 'dynamic favicon' setting
Merge pull request #995 from novemberkilo/master

Refactoring Post model
Merge branch 'master' of github.com:discourse/discourse