Implementing RequiredParameterForAnnotationCheck

This also includes these followings commits that were meant to solve final considerations before merging: https://groups.google.com/forum/#!topic/sevntu-checkstyle/YibCclEYexs

1. Please remove redundant return at ForbidAnnotationCheck.java, line 25 as it has appeared after your changes.

2. There is a minor typo in Check JavaDoc: also improving it a bit

3. Please update Joiner.on(",") to Joiner.on(", ") to let printed error be better formatted. I've also did some improvements to the test here and found a little bug where the order of the parameters is not respected when printing.

4. From /eclipsecs-sevntu-plugin/src/com/github/sevntu/checkstyle/checks/annotation/checkstyle-metadata.properties: fixing typos