Added ability to parse a variable that contains the contents of a .po file

[motin]

No description provided.

[pherrymason]

Yeah, as the class evolves I see things that need to change. I already thought about changing the read method to parse. Now having two methods to parse po data has even more sense to change it to parse. Feel free to change it (if you can also update the unit tests would be nice ;) ) and I will merge it.

[pherrymason]

I'm still interested in merge this ;)