Add PHP_CodeSniffer task

[dthomas]

Add a task for PHP_CodeSniffer with the following features:

• specify one file or a fileset to check (you can even specify directories and PHP_CodeSniffer will search for the files)

• specify the name of the standard or and absolute path to a custom external stored standard (requires PHP_CodeSniffer 1.0)

• setting of the parameters PHPCodeSniffer has: showWarning, verbosity, tabWidth to replace tabs with spaces, allowedFileExtensions, ignorePatterns, noSubdirectories, configData

• choose between the custom output format implemented in the task itself or one of the formats PHPCodeSniffer provides: xml, checkstyle, csv, report and summary

• generate the docs by setting the output format to doc

• output the list of used Sniffs

• documentation of the task

[dthomas]

(In [328]) Refs #202 - Added PHP_CodeSniffer task and documentation

[tazelvarr]

tariccasitr