Filtering boards on the home page

This is for issue https://github.com/balopat/codingboard/issues/3. I have added a filter input on the home page. It displays only when there is at least one board. It is case sensitive.

There is a couple of tests covering this. I have put the tests on the test class already exists. I was having some issues because if there are several classes they are not run on the same order all the times.