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
Conditionally override airline separators only if powerline fonts are not used.

The Airline separators were unconditionally overridden. I have conditionally overridden the separators only if the user doesn't use Powerline fonts.

User is expected to specify `g:airline_powerline_fonts=1` in `~/.vimrc.before.local` instead of `~/.vimrc.local`.
Merge pull request #441 from SaswatPadhi/Fix-for-overridden-airline-separators

Conditionally override airline separators only if powerline fonts are not used
Populate .vimrc.before with all spf13 options

* .vimrc.before should not be modified (just like any other non-local
  or non-fork config file)
* .vimrc.before contains a list of all options that can be set
* .vimrc.before.local is where these options would actually be set
* support .vimrc.before and .vimrc.before.fork in install scripts
Option to clear instead of toggle search highlighting
Fix solarized if statement

endif came before setting all options
Update some formatting
Merge pull request #447 from sbennett18/before

Populate .vimrc.before with all spf13 options
Merge pull request #449 from sbennett18/3.0

New spf13-vim option, formatting, solarized if statement fix
Merge branch '3.0' of https://github.com/spf13/spf13-vim into 3.0
Bug fixed upstream