Restore skwp colorscheme to 256 XTERM values

See https://github.com/altercation/vim-colors-solarized#the-values
Add skwp16 colorscheme for terminal vim

This colorscheme is based on Solarized-dark colors, setting the
*specific* values for the Solarized palette, using the terminal's
16 ansi color values.

See https://github.com/altercation/vim-colors-solarized#important-note-for-terminal-users
Replace several colors in status line with the Solarized palette colors
Update CtrlP and NERDTree with the Solarized palette colors
Add skwp16 theme

Adds filetype and scrollpercent to skwp theme.
Add authors to Solarized themes

Refs #230.
Rename skwp/skwp16 to solarized256/solarized16

Closes #230.
Add Solarized Light color scheme

Closes #234.
Add g:Powerline_cache_dir setting

Closes #227.
Closes #228.
Fix GetShortPath() error on Windows

Closes #202.
Add deprecation warning
Add support for command windows (q:, q/)

Previously it worked for q: only due to the FileType event.

Fixes #196.
Setup statusline for all windows opened when vim starts

Fixes #187.

Note: netrw is known to spoil things.
Use stricter matches. Also don’t count on 'ignorecase' option when matching buffers

Fixes #182.

Note: don’t know what to do with LustyExplorer and vimpager: unable to
get buffers with such name or filetype.
Merge github.com:Lokaltog/vim-powerline into drcs