So much since last commit - can't remember it all:

- Phonics to Unit 10
- Added vocab categories Grammar, Home and Weather
- Added new vocab to match (mostly) curriculum for 2014
- Moved some from School to Home
- Set up substitution to allow punctuation in phrases and allomorphs, substitutes to legal filename for image
- Separated currCategoryDir and currCategoryTitle so that sub-category titles and buttons work properly
- Started working on tablet support, but found that Chrome on Android now supports simultaneous audio on 2 channels (code still in place but inactive)