Add promptline.vim extension
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.
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
tabline: add support for tab_nr_type as string

'__tabnr__' gets replaced with the tab number. This allows for custom
configurations, where you want to have both the tab number and the
number of windows at the same time, e.g.:

    let g:airline#extensions#tabline#tab_nr_type = '[__tabnr__.%{len(tabpagebuflist(__tabnr__))}]'