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
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
Clean .vimrc.bundles
Remove redundant sourcing

.vimrc.bundles.local & .vimrc.bundles.fork are both sourced in
.vimrc.bundles, so remove the redundant sourcing from .vimrc