updated word droid addres
Settings clean up
Sync UI flow fixed
Optimized save / service
Removed upload stats method

This method will be implemented later
Removed settings entitiy
Removed 'Word' dependency from ExamWord
package refactoring
hierarchical refactoring - views finished
Implemented database save
Empty sections return no words now
words serialization fixes
fixed section removal during sync
fixed exam history browsing
exam stats computation stub
exam stats computation implementation
fixed date display problem
fixed date format
updated target sdk