git: add .gitignore
travis: add .travis.yml
gem: use vimrunner
gem: use rake and rspec
gem: use social_snippet (via GitHub)
rake: add spec task
test: use vimrunner
test: add enable_social_snippet() helper
test: add vim_current_buffer() helper
commands: add show_version()
add :SSVersion command to show version
commands: add insert_snippet()
add :SSInsertSnippet command
test: commands: add tests for :SSInsertSnippet
social_snippet: add version()
complete: add repo_name mode
complete: add file_name mode
test: complete: add tests for repo_name / file_name modes
neocomplete: add social_snippet source
Merge branch 'wip/start-up/1415152748'

* add :SSVersion command
* add :SSInsertSnippet command
* support neocomplete to complete snippet paths