Let <leader>ll toggle compilation (see #59)
Added command and doc for latex#latexmk#toggle
Fixed empty tmp-file bug in latexmk#output()
win32: Wrap bg cmd in quotes
Merge pull request #60 from LeszekSwirski/fix-win32-quote-bg

win32: Wrap bg cmd in quotes
Improved doc on ignored warnings (see #61)
Merge upstream update