Try to detect filetypes abducted by Eclim.
Try to detect checkers disabled by YouCompleteMe.
Slightly more meaningful messages for checkers disabled by Eclim and YCM.
Bug fix: make sure directory returned by syntastic#util#tmpdir() exists.
Clisp: workaround to remove ciompiled files.
Scss-lint: syntax errors should have subtype syntax (@sds).
Ruby: add reek style checker
Reek checker: cleanup.
Remove the avrgcc checker for Arduino.

According to #1173: "When the Arduino IDE compiles arduino files,
they're not just passed to avr-gcc -- there's some preprocessing that
happens".  This is the template problem, and syntastic doesn't have a
solution for it at this time.
Dartanalyzer can now return exit code 3.
Shut up vimlint.
FAQ: add a note about HTML Tidy for HTML5.
README: rephrase.