pyflakes: update errorformat.
Security: disable the perl checker by default.
README: minor updates, rewording, and formatting.
README: put examples in accord with the defaults.
Allow foreign checkers to call foreign preprocess and postprocess functions.
Simplify main/1 heads
Properly add deps/*/include to header file path
Don't forget about ebin/
Version tracking.
Merge pull request #1018 from lavrin/search-apps-deps-libs

Erlang: search apps/, deps/ and libs/
Make "g:syntastic_<filetype>_checkers = []" work as expected.
phpcs is slow as a css checker, remove it from the defaults.
\V<pattern> regexps can spell trouble if <pattern> contains backslashes.
Minor cleanup.
Bump version number.
Fix link.
Merge pull request #1027 from jseabold/patch-1

Fix link in CONTRIBUTING.md.
fix javascript/eslint format
ESLint: add version check; expand config parameter.
Expand a few config parameters.