Merge pull request #428 from jacobwalker0814/airline_updates

Airline: Disabling Powerline Fonts and Updating README
Add various useful commands

* Shell command opens split with results from running command
* * Similar to !<command>
* Find merge conflict search
* Tag files can be placed in .git/tags and will be found at all levels
  of a git repository
* New airline separators
* Allow repeating visual mode commands
* Minor formatting
Merge pull request #429 from sbennett18/3.0

Add various useful commands
Add mappings for some more fugitive commands: Gread and Gedit
Workaround fix for vim-gitgutter issue #106

Reference
https://github.com/airblade/vim-gitgutter/issues/106
Merge pull request #433 from beepscore/3.0

Workaround fix for vim-gitgutter issue #106
Source optional .vimrc.before

Adding an optional .vimrc.before as suggested by @spf13 in Issue #428
Merge pull request #432 from jcromero/3.0

Add mappings for some more fugitive commands: Gread and Gedit
Merge pull request #434 from mikedfunk/patch-1

Source optional .vimrc.before
updated documentation and comments for .vimrc.before
Merge pull request #435 from mikedfunk/vimrc_before

updated documentation and comments for .vimrc.before
before -> before.local & adding before.fork
Update README to reflect before changing to before.local & add of before.fork
Issue #428 Airline Powerline Symbols

+ Add hook g:spf13_enable_airline_powerline_symbols option
+ Update README and linked image