Beer xml updates

Fix some missing data imports from beerXML (style, brewer information, etc...)

Add export of recipe(s) to BeerXML. You can select 1...* to save to a single file.

On Android API 19+ it uses the content resolver intent, on lower APIs it uses the ExternalStorageDir and just allows people to set the filename.

Tested on Android Emulator API v10 & v21

Also adds missing fields from the Style and Recipe objects.