Adding taglist plugin to vim
Added ctags configuration

* vimrc checks if ctags is installed before adding configuration
* added mapping for toggling ctags window on and off to F<F4>
* added mapping for building ctags for the current directory
Remove powerline plugin

* Comment out references to powerline from vimrc
* Remove the sumbodule with git submodule deinit
* remove the powerline location directory
Added vim-airline plugin as a submodule
Added airline configuration

* special characters taken from powerline
  * display airline even when there is no split
Merge branch 'vim_ctags'