Resolved: BL: Improve coverage BL

resolved: BL: Tests for removeExhibit

resolved: BL: Tests for removeExhibit: deleted unused variables

Resolved: BL: Test for updateExhibit

Resolved: BL: Tests for updateContentItem

Change baseUrl for UI tests

to http://test.chronozoom.com
Merge branch 'master' of github.com:a-chumagin/ChronoZoom