Added basic support for flycheck.
Reenable ignore-errors.
Add custom checker for checking CSS/JS files with phpcs.
Check if our checker can be used before enforcing it.

The buffer could be in some derived mode that flycheck wont activate
the checker for, which results in errors if we try to enforce it.
Fixed documentation.

Don't pretend to be flymake-phpcs.
Mark `drupal/flymake-phpcs-standard' as obsolete.

And as an alias for `drupal/phpcs-standard'.
Merge branch 'develop' into pr/35
Drupal 8 moved the version number to a new file.

Fixes #36.
Added .cask to .gitignore.
No need for make-local-variable.
No need for #.
Properly add our checkers to flycheck-checkers instead of enforcing it.
Really no need to check for existence of phpcs command.
Check for drupal/flycheck-phpcs-js-and-css in predicate, now we don't enforce it.
No quoting necessary, says wiser minds than mine.
Use setq.
Added `hash-table-p` check.
Merge pull request #37 from xendk/develop

Fixups to flycheck support.
`drupal/phpcs-dont-show-trailing-whitespace` common to flycheck and flymake.
Added missing EOL.