Apache commons + creation of file

Added Apache commons io to lib folder.
TextFormatterImpl now creates a new file with the right name. Still does
no formatting.
TextFormatterImpl refactoring + clean dir bugfix

Refactored the generation of the output file name.
Fixed a bug, where the output file writing stream wasn't closed.
Tidied up the testing a bit.
Comma to dot

TextFormatterImpl now converts all commas to dots correctly.