Fixed EZP-19916: Limit parameter for eZFlowLatestObjects fetch class is sometimes ignored.

Make sure that lower limit parameter or new fetched content does not increase number of items in the block
(by removing the old items first)
Fixed EZP-18520 - eZ Flow cannot handle sso logins
Update master
Fixed EZP-20183: eZ Flow displays wrong date on manual block types for items still on queue.

Make sure to update block item timestamps when disabling rotation.
Changed: welcome 2013
Fixed EZP-19668: eZ Flow layout zone changes are not immediately visible

Based on jjCavalleri's pull request
Support browse mode start nodes
Code style fixes
Improve naming of StartBrowseNode settings
Fixed EZP-20597: Wrong packages versions in eZ Publish 5.1.0beta1
Fixed EZP-20596 - PHP Warning after eZ Publish 5.1.0beta1 demo data installation
EZP-20654: Use localStorage instead eZPageBlockState cookie to handle block states
Fix EZP-20654: eZPageBlockState crashes page edition because the cookie reaches maximum size.

- Used pr 46.
- Using local storage if it is available on the browser and a cookie if not.

Closes #47
Changed: removing calls to deprecated isLoggedIn() method
Fixed EZP-20818: [eZFLow] Adding a source to multimedia carousel throws an missing info error

This is related to the change introduced by fixing EZP-20455:
https://github.com/ezsystems/ezpublish-legacy/commit/e39d2077d6dbf2a2b1de4597733d2f89cbc0f338
Fix 20839: Make sure the YUI3_config is used when loading YUI3 components
Fix EZP-20793: Replace google api 2 with 3
Fixed EZP-20451: block_view_gui for a manual fetched block don't use override templates
Fix EZP-21009: Cannot redeclare class eZObjectForwarder in ezflow
Fix EZP-21138: deleted nodes remain in an eZ Flow block