Promote John Szakmeister's szakdark colorscheme to shared colors directory.
Decrease ttimeoutlen to 50 ms to reduce the lag for detecting <Esc>.

This helps with plugins such as John Szakmeister's vim-cursortoggle
which make visible the transition from Insert mode to Normal mode.
With ttimeoutlen=150, there is a distracting lag when pressing <Esc>.
At 50 ms, the distraction factor is significantly reduced.
Re-sync syntax highlighting from start of reStructuredText files.
Upgrade BufExplorer to version 7.3.3.
Upgrade vim-pathogen to 2013-01-19.
Sync with upstream.