Added 'build/' dir to list for command-t to ignore.
Replaced powerline plugin with airline.
Split plugin config into pre- and post- init groups.
Added gitgutter plugin.
Added tweaks to sign column.

* Added line to override SignColumn background color for GUI
* Added dummy sign to new buffers to keep sign column always open
Disabled HTML syntax checking in Handlebars files.
Updated syntastic plugin.
Changed fancy warning symbol to '!' to prevent clipping.
Updated fugitive plugin and added mapping for :Gstatus.
Gave Makefile some love, removed 'command-t' target from 'all'.
Updated pathogen.
Added spell file and make task for building Vim spell file.
Updated Command-T, removed from default make task.

* Command-T must be linked with the correct ruby binary using RUBY_VIM
* On clean installs, make must now be run with `make all`
Updated NERDTree to fix initialization errors.
Fixed issue with make not using the correct Vim.