integration of RI tree machanism into current CZ storage
correcting offset for year values in RI-tree
Entities Test and Code Analysis
Add check is leap 1700 year
Merge pull request #160 from yl790/master

integrating the RI tree mechanism into current Chronozoom.Entities
Merge pull request #161 from javierluraschi/EntitiesTest

Entities Test and Code Analysis
resolved: Add method for deletion timeline from server
Add 3 authentication UI tests

For:
google user
yahoo user
Ms user
Merge pull request #163 from a-chumagin/master

authentication UI tests, delete timeline from server