'get_children()' flagged as a blocker

This WordPress function can be pretty dangerous. Check the issue https://github.com/Automattic/vip-scanner/issues/123
Merge pull request #139 from vaurdan/flag_get_children

'get_children()' flagged as a blocker
Merge pull request #140 from vaurdan/flag_forbidden_vars

Flag $_REQUEST superglobals
Add PHPStorm project files to .gitignore.
Update wp_title() regex to work with multilines.

Uses the regex /s modifier so that the dot character matches newlines.
Dedicated slug for the title error.
Add HeaderCheck unit test.

Contains tests for proper title implementation.
Move title checks to own file, refactor tests.
Refactor HeaderCheck tests.

Use a fixture in an external file to test valid header.
Remove CodingStandards from WP.com Theme Review.
Add CDNCheck.

Checks whether JS or CSS resources are loaded from a CDN. Looks for the
CDN URL of popular libraries and frameworks.
Merge remote-tracking branch 'upstream/master' into yui-compressor

Conflicts:
	vip-scanner/config-vip-scanner.php