Flag any non-validated/sanitized super global input vars.
Closes #72
Switch list of sanitizing/autoescaping function to a static var to be used by other classes
Add empty() to unit test
Fix usage of empty()
Merge branch 'develop' of github.com:WordPress-Coding-Standards/WordPress-Coding-Standards into issue/72

Conflicts:
	Sniffs/XSS/EscapeOutputSniff.php
Fix indentation, convert to tabs.
Merge pull request #101 from WordPress-Coding-Standards/issue/72

Flag any non-validated/sanitized super global input vars