Bugfix for DS-2012: commit after login to store last_active field.
DS-1994: Use HTML5 to upload files in Submission Process of JSPUI.
Use html5 upload only if supported by the browser. Fallback is default.

The old upload should be the default upload. HTML5 upload should be used
only if it is supported by the browser. This commits repairs the use of
the old upload and makes it the default.

A severe bug was found and fixed by this commit: The first version of
this feature was not thread safe as it used a instance variable were it
shouldn't. This commit fixes this bad behavior.

The message to inform the user, that its browser does not support
enhanced upload can be translated now.
Merge pull request #553 from tuub/DS-2012

Bugfix for DS-2012: commit after login to store last_active field.
Merge pull request #551 from tuub/DS-1994

DS-1994: Use HTML5 to upload files in Submission Process of JSPUI.
DS-2093: Remove dependency of dspace-api on backport-util-concurrent.
Merge pull request #594 from tuub/DS-2093

DS-2093: Remove dependency of dspace-api on backport-util-concurrent.
Adds configuration property for DS-1994.
Merge pull request #595 from tuub/DS-1994

Adds configuration property for DS-1994.