added new tests for bibliography)

added delete exhebit by api
Merge pull request #931 from a-chumagin/b3

added new tests for bibliography)
[Feature] Media List control is integrated with Bing Search mediapicker.
[Feature] Bing search API.

Details:
1. Created sample page where Bing search results displayed (images, videos, documents - only pdf).
2. Replaced Bing search response types with default types from BingSearchContainer.cs
[Feature] Bing Search mediapicker implemented.
Merge branch 'master' of https://github.com/alterm4nn/ChronoZoom
Merge pull request #930 from MichaelKalygin/mediapicker-guide

[Doc] Added guide for Media Pickers.
[BugFix] Fixed minor bugs of Bing mediapicker.
[Feature] Implemented align of thumbnails for video & image search.

1. Implemented align on sample page also (/samples/bingSearchSample.html).
2. Implemented align for content item authoring form.
[BugFix] Final improvements of Bing mediapicker.