Merge pull request #93 from WordPress-Coding-Standards/develop

Add Travis CI integration and a pre-commit hook
Flag usage of functions that modifies Filesystem
Closes #71
See http://vip.wordpress.com/documentation/code-review-what-we-look-for/#filesystem-writes
Add filter_input / filter_var to list of sanitizing functions in XSS sniff
Closes #99
Add more functions that modify filesystem
Merge pull request #98 from WordPress-Coding-Standards/issue/71

Flag usage of functions that modify filesystem
Supply filter_input arg
Merge pull request #100 from WordPress-Coding-Standards/issue/99

Add filter_var / filter_input to sanitizing functions
Merge branch 'develop', remote-tracking branch 'origin' into function-restriction-sniff
Improve FunctionRestrictionsSniff, convert to abstract class
Move existing groups to VIP\RestrictedFunctionsSniff ( switch_to_blog #82 and eval family #81 )
Add warnings about remote calls #85