Refs #1465. Refactored integration tests by splitting each individual test in...

Refs #1465. Refactored integration tests by splitting each individual test in Main.test.php up into separate files.

NOTES:
  * New tests use the Test_Integration_Facade type that makes the tests easier to read.
  * Split Database.test.php into two types (in the same file) so the hello world test cases aren't duplicated every time another type derives from it.
  * Number of passes changed from 10233 to 10278 for all tests. The increase is due to further splitting up of certain tests.



git-svn-id: http://dev.piwik.org/svn/trunk@5668 59fd770c-687e-43c8-a1e3-f5a4ff64c105