fixes #1585

Moved file and path related methods from StringHelper to FileHelper, renamed StringHelper byte methods not to be misused as string methods

now also gets stderr output.

fixes #1140

adjust depended asset position or throw exception on conflict

removed test param 'appClass' as it does not make sense to configure
application class for all tests, some explicitly need webapp where
some might explicitly need console app.

issue #303
Here is the proposal for RESTful routing syntax:
https://gist.github.com/cebe/5674918

- Better names
- Removed not used MySQLTestCase
- Moved base testcase for DB to db namespace
- Minor style fixes