Line Movement Macro - vimrc.

Move current line up one line with _
Move current line down one line with -
Added mapping for local leader
 - currently not used
Replaced map with noremap
- to avoid subtle recursive bugs
Removed exercise cruft from VimScript exercise.
Open python shell directly from vim.
Added mapping to quick-edit vimrc.

<leader>ev launches .vimrc in a new instance of vim,
then sources it upon exit.