Fixed some issues with ProblemsViewTest Fixes  #546

- added more waits for ProblemsView refresh
- the error messages are more verbose now
- fixed wrongly written asserts
replaced command categoryId with right one. Fixes #550
Extending TextEditor capabilities. Fixes #350.
Changed sync to async while sending events for link to activate #551
notify tree in async thread. Fixes #534
Added a test case for 'CloseAllShells' method
Find Link by anchor text also. Fixes #553
Improved ToolBarMenuTest
Fixed closeAllShells
Capture a screenshot when some shell remained open
RedDeer 0.5 release

All versions are now set to 0.5.0 for RedDeer release
Update RedDeer version to 0.6.0-SNAPSHOT

0.5.0 is dead, long live 0.6.0
Reduced time the test server takes to start, stop etc.
Changed TimePeriod from enum to class. Fixes #547
Possibility to set text of tree item. Fixes #557
Removed deprecated usages from views&editors. Fixes #544
Browser condition using Matcher
Created RedDeerException. Fixes #574
Updated archetype version to 0.6.0-SNAPSHOT

For some reason the version plugin missed this, so I'm updating
the version separately here.
Fixed deprecated API usage warnings in workspace  (#566)