Find appropriate origin

`gp` with no arguments will find the most suitable origin, forks have
higher presedence.
With given arguments, it will work and complete as expected
Prefer `git co` to `go`
Jump to first match while grepping
Don't scan included files for tab-completion
Change initialize abbreviation to `dinit`
Move grep.vim settings to plugin/settings
Let `d<enter>` fire up dispatch in the background
`du` repeasts the last dispatch command
`d<space>` opens up a customizable dispatch
Remap `dq` to toggle the special dispatch quickfix

Mnemonic => "dispatch quickfix"
Activate/deactivate a test in rspec

As well as in minitest
Run tests without ruby warnings