Add promptline.vim extension
solarized: use VertSplit bg for inactive statusline

Adjust foreground color accordingly, also for non-active modified
filename (to stand out).
Merge pull request #402 from edkolev/prompt-extension

Prompt extension
Minor spelling 

5th bullet point in Features section had the word "colorschemes"

Proposed fix: color schemes
Allow changes to airline_symbols.branch after init

If the user updates the airline_symbols.branch variable later in the vimrc, the value will not update after the initial init.  Since these variables are only used in the get_head() function, I moved them locally within the function to allow evaluation on each instance.
Merge pull request #412 from gabriellim/patch-1

Minor spelling
Merge pull request #413 from ralesi/patch-1

Allow changes to airline_symbols.branch after init
Add deeper netrw support, including Git branch head and netrw sorting
options
Merge pull request #418 from ralesi/netrw

Add deeper netrw support, including Git branch head and netrw sorting
happy 2014
account for possibilty of branch extension unavailable. resolves #419.
Revert changes to s:NM, add s:NMi for inactive windows
Added new color theme: Kalisi
Merge pull request #428 from eyetracker/master

Added new color theme: Kalisi
Add new color theme: hybrid
Merge pull request #434 from yasuoza/hybrid-theme

Add new color theme: hybrid
tagbar: only lookup tag once every second

This makes scrolling (holding done j/k) much smoother, and the current
tag gets pulled in via CursorHold anyway.

Fixes https://github.com/bling/vim-airline/issues/387
Clarify doc for loading custom extensions
minor doc fix: s/various some/various/
Merge pull request #441 from blueyed/tagbar_once_per_second

tagbar: only lookup tag once every second