update main menu
add Faraday gem
add SnippetPuller
add omniauth scope#gist
refactor user_spec
Add snippet_puller_spec
add webmock gem
add snippet_puller
add GithubApisController and spec respectively
add github-apis-gists and update main menu and update routes
require webmoc gem in rails_helper
add stub for github api
add SnippetFile
add Snippet#has_many snippet_files
remove content params out SnippetsController
fix code for removing snippets content
add snippet_file_factory
add SnippetFileViewNew
update services/snippet_puller_specs
add stubs/github_api: get github gist by code