Add OmniauthCallbacksController spec
update staging env
remove mailer for testing
add mailer
update staging env
update staging environment: sendgrid
add tag_factory and update SnippetsControllerSpec#create
Update SnippetsControllerSpec#update
update #tagable destroy spec
update SnippetsController#index
update SnippetsController#index and add SnippetsControllerSpec#my_gists and add SnippetsViewMy_gist
update show_snippet_listing_feature and add show_my_gists_feature
rearrange mainmenu
update main menu
add Faraday gem
add SnippetPuller
add omniauth scope#gist
refactor user_spec
Add snippet_puller_spec
add webmock gem