Add Unicode 'Arrow' to ZSH Prompt

Replace prompt text with full unicode box-drawing characters

Tested-on: arcturus <12 Feb 2014>
Enable ColorLine and WildMenu support in vim

colorline enables highlighting of current line
wildmenu shows tab-completions in statusline

Also places custom color options after previous colorscheme settings to
assure that all are applied in most, if not all, cases.

Tested-on: arcturus <12 Feb 2014>