Revert "Remove dispatch.vim"

This reverts commit 886c25c8b13bf016a25999d15cfbd85b4501cf0f.
Revert "Use vim-rspec and dispatch instead of our own homecooked spec function"

This reverts commit 48004a84ef29e8887752be64ea724b0d8fe4691b.

Conflicts:
	bundle.vim