Merge pull request #26 from shuhei/gravatar

Show Gravatar icons using email provided by OmniAuth
Updated db/schema.rb
Bumped dependencies
1.3.2 CHANGELOG
Fixed mouseover on gravatar_image

https://github.com/seratch/gistub/pull/26#discussion_r8783702
Merge branch 'develop' of github.com:seratch/gistub into gravatar

Conflicts:
	app/helpers/application_helper.rb