fixing some tx stuff

plz check this

I've updated .tx/config so a 'tx pull -a' retrieves all languages from transifex
(note: paver clean also removes them all. Maybe leave them in the dirs, either put them in .gitignore or just check them in periodically?)

after paver extract_messages and paver compile_messages the po stuff is compiled
but the tx files are not... seems something to do with missing info in .pro file?? When I make a 'release' file with linguist (just load the ts file, and do File/Release, a ui.qm file will be generated next to ts file). 
The dialog will be translated (small fix in plugin .py to make 'qgis --lang it' work)
Q1: how is the pro file generated (and can it be fixed so all locales will have a release)?
Q2: how will the loading of the translated docs work?