added empty DataList class file
DataList base class implementation ready
tab preview styling update to keep sreen at top upon tab switch
properties and methods access fixes
GPS class access fixes
access fixes for Compass class
GPS class update to location retrieval (smoother behavior but may cause higher battery consumption)
Storage class access fixes
GPS location property renamed to position
added Location class
added LocationsDataList class (extends DataList)
clas inheritance bug fix; loading new classes on page
merged with master
[automated] combined and minified JS