Rspec.vim take up too many home row leader mappings.

Rearrange key mapping to be more sensible and stop Rspec.vim hogging
lots of single key mappings using home row letters.  Also preparing to
try out Unite.vim
Trying out Unite.vim

Rearranged a bunch of mappings to accomodate.

Also removed LustyJuggler as Unite can do something very similar.