fixed activity next button acting like prev
styles for buttons, widget from templates

fixes #64
renamed classes to most significant first
add sample stations on install
details updated on stop, #fixes #63
better player details state management, minor changes

activity and widget currently playing text is updated on edit, add, delete, widget resize, activity resume
not sure if widgetprovider unbinds correctly, service not destroyed on stop (but not destroyed after activity play either)
fixes #65
fixes #63
fixes #9
fixes #8
creates #66