#397
- NavigationHandlerFragment: now it extends CommonFragment so we can
trck lifecycle events
- NavigationHandlerFragment.FragmentWrapper: renamed method getFragment
to getInstantiatedFragment
- NavigationHandlerFragment: added super call  to the onCreateView
method
- NavigationHandlerFragment: getFragment method now calls
adapter.getActiveFragmentinstead of getItem which may return invalid
data in some cases
- NavigationHandlerFragment: getAccountFragment replaced adapter.getItem
with getFragment call
- NavigationHandlerFragment.FragmentAdapter: added registeredFragments
field
- NavigationHandlerFragment.FragmentAdapter: setPrimaryItem now
newFragment variable is taken from passed object parameter
- NavigationHandlerFragment.FragmentAdapter: added new methods
getActiveFragment and makeFragmentName to search created fragments by
tag
- NavigationHandlerFragment.FragmentAdapter: getItem now calls
getInstantiatedFragment instead of getFragment