added new features and upgrade notes for 2.1
added note about non-functional `options` attribute
fixed typo
Minor additions

Conflicts:
	Documentation/Manual/Upgrading21.md
Merge branch '2.1' of https://github.com/triAGENS/ArangoDB into 2.1

Conflicts:
	Documentation/Manual/Upgrading21.md
fixed unrestricted queries in cluster dashboard
fixed jslint warnings
added generated
fixed bug in too eager datafile removal
updated CHANGELOG
added rewriteRequest
restrict cap constraint for _statistics
Use /_admin/server/role instead of /_admin/execute for dump/restore.

This prevents a warning in the logs and is cleaner.
fixed db.collection.geo documentation
added derived file
issue #864: Inconsistent behavior of AQL REVERSE(list) function
updated CHANGELOG
fixed date
issue #865: added notes about Debian sid
issue #865 update