Extra evil-leader mappings.

Add <leader>bs mapping for buffers.
Change ace-jump mappings from <leader>a{w/c} to <leader>m{w/c}.
Changed the scrolling mappings.

Now includes half page scrolling.
Had needless calls to kbd - removed.
Wrap region disabled in evil-mode.
More unimpaired mappings - motion over errors.
Make C-u act like vim in evil-insert-state.