ditch single point logging
simplify even more pref screen by moving loging details to advanced preferences
first part of refactoring (more to be done)
Introduce location buffer
remove dep on google service
move min SDK from 7 to 8
upgrade async-http lib (1.4.1 -> 1.4.4)
upgrade ABS lib (4.2.0 -> 4.4.0)
publish new release