Create base classes for storage and model
Move LocationPoint to new factorized storage classes
Improve the paramterization for later Models
Further improving of parameterization: not the end of this story
Finally fix the unchecked cast warning (see http://stackoverflow.com/questions/16689810/casting-a-generic-superclass-to-a-subclass)
Start upgrade to SDK 17 by including in Travis
Factorize Poll and PollsStorage
Fix new calls for location and poll storage
Fix factory pattern
Typos and cosmetic changes
Merge pull request #44 from wehlutyk/feature/factorized-storage

Feature/factorized storage