Simplify the detection of android.
This also makes it more robust.
Merge pull request #603 from vandenoever/android01

Simplify the detection of android.
Return only operation specs as transformation result, not operation objects
Merge pull request #604 from kossebau/noFactoryInTransformer

Return only operation specs as transformation result, not operation objects
Refactor calculation of CSS content for lists

Moved the processing of the list style to get the content rule into a
separate method so it can be re used for continue list styles. Also
ensured that the new getContentRule function returns a complete rule with
the semicolon on the end.
Support multi level list numbering

Implemented a changed list counter setup where each list level has its own
counter. This is to support behaviour defined where you can display only a
subset of the list numbers.

This is defined here:
http://docs.oasis-open.org/office/v1.2/os/OpenDocument-v1.2-os-part1.html#__RefHeading__1418890_253892949
Provide each text:list with a unique CSS counter

Giving each list a unique counter allows us to implement continued
numbering functionality while avoiding unexpected numbering due to how CSS
counter values are scoped to an elements sibilings or children.

This refactoring also fixes a bug where multi level lists would have zero
values appearing in the list labels.