updated ordering of lists

Issue #77
taps list shows message if there are no beers or kegs in system

Issue #53
update to Issue #53
Added beerType

Issue #78

created beerTypes table, updated beers table. updated beer list and beer
form
changed beerTypes to beerStyles

Issue #78
update keg's status on tapping/kicking

also only show available kegs in the tap form
Merge branch 'master' of https://github.com/RaspberryPints/RaspberryPints into Install
Fixed error with sample data