Adds AlignAssignments plugin (mapped to ;=)

Supports aligning assignments based on the appropriate assignment
operator of the language.
Adds grb256 color scheme.

Also adds ir_black since it's based on it; however, I ended up pasting
ir_black into grb256 for now.
Changes vimrc for colorscheme and a few other cursorline things

Updates colorscheme to grb256 with a few modifications to look better
in terminal windows.  Make sure TERM=xterm-256color to fully use the
available scheme.