Added info to changelog for recent pull requests.
Added comment regarding the fact that the temporary bug fix should be eventually removed.
fixing segment io settings bug

* Moving to the auth tokens section
* Removing the feature flag logic since all features are loaded earlier
```
    for feature, value in ENV_TOKENS.get('MITX_FEATURES', {}).items():
        MITX_FEATURES[feature] = value
```
moving settings into the auth tokens section
Merge pull request #180 from edx/jarv/fix-segment-io

fixing segment io settings bug
Merge pull request #179 from edx/valera/additional_comments_on_youtube_api_bug

Addtional comments for YouTube API bug.
Merge pull request #178 from edx/valera/adding_changeleog_info

Added info to changelog for recent pull requests.
add new collection configuration to support a 'trashcan' for assets. Update class factory to allow callers to specify if they want the default set of assets or the trashcan
add ajax callback entry point to remove the asset
fix sizing of the delete column
add CHANGELOG entry for work
update warning message
add unit tests for asset delete/restore
use the new notification tools for the confirmation dialog
remove invalid comments
forgot to internationalize one string
put back the verbose switch in xml_importer.py
there is no default for empty_asset_trashcan, caller must provide a list
add unit test for emptying the trashcan
allow for an optional throw_on_not_found on contentstore().find() so we can clean up caller logic in the tests