add extensions/integration section with screenshots
added airlinetoggle function
Merge pull request #141 from chrisbra/master

added airlinetoggle function
check initialized so autoloaded plugins happen first
add support for the command-line window
check existence of airline augroup before overwriting statusline
add shortform into doc for easy copy/pasting
basic working dynamic statusline builder
allow warning section to collapse away
move builder to its own file
reload separator colors on demand
update separator colors when mode changes
introduce util file
move getwinvar over
remove redundancy from the map
miscellaneous minor changes
add example.vim extension (#134)
add highlighter class
fix separator colors for inactive splits
add profiler. optimize separator highlighting.