Input error messsages base.
Improve error feedback in authoring forms

Details:
1. Add client-side validation error feedback for authoring forms (timeline, exhibit, contentitem);
2. Add server-side validation error feedback for MediaSource input in authoring forms (exhibit, contentitem);
3. Disabled obsolete authoring tests (alert window on error)
Bugfix #682
Merge pull request #1094 from a-chumagin/master

Changes for tests
Triples Regex improvement
Tirples - GetTimelineURL function added
Triples TimelineShortcut Title fixes
Triples APIoperation fix
Merge pull request #1096 from a-chumagin/master

workaround for test
Merge pull request #1090 from alex-zen/error-messages

Error messages
Implement add favorite button for timeline
Triples, API change according to REST API rules
Merge branch 'master' of https://github.com/alterm4nn/ChronoZoom into Triples
Merge pull request #1100 from a-chumagin/master

fixing image type issue
Merge pull request #1095 from yuzhay/Triples

Triples Regex improvement
Merge pull request #1098 from alex-zen/favorite-btn

Implement add favorite button for timeline
improve test for FriendlyUrl

add new test

fixing image type issue

added new test and improved existing

deleted unused using

refactoring for 3 classes
Merge pull request #1102 from a-chumagin/r2

improve test for FriendlyUrl