Add tagbar: toggle with <F8>

Currently configured to work well with ruby,css and golang (via vim-go)
Recommended setup (for OSX) is to use this:

```
brew tap kopischke/ctags
brew install ctags-fishman --HEAD
```
Add note about ctags to the docs
Add vim-airline back, uses patched font if available

This will check if the font is installed, if it's not it falls back to a
simpler appearance. If you're on terminal you need to make sure that
non-ascii is rendered with the patched font (if you have it installed)
otherwise vim will look aweful.

This supports OSX and maybe some installations of linux (assuming your
    font is installed at /usr/share/fonts or ~/.fonts). On windows or
other installations of linux it will gracefully fallback to the simpler
view.

[Closes #10]
Add echodoc.vim - helps you with the function arguments
Consolidate completion/snippets config into the right files
Close completion with more keys [.,:;/]

[Closes #11]
Don't reposition cursor on git commit buffers
Better support for closing autocomplete without lua
Fix bug with neocomplete and special keys
Add instructions for lua support on OSX
Update from any branch not only master
Fix flawed login when deciding wheter or not to use Powerline font
Remove unused indentLine.vim
Add tags to gitignore
Add vimlint and travis.yml for vimfiles verification
Add travis badge
Remove clutter from airline
Make install less chatty
Cleanup readme
Better instructions for linux ctags