get user databases needs to have the capability to read from a database
other than _system, in the case the user does not have the ability to
connect to the system database.
added database creation/deletion utility.  requires a connection with
access to the _system database.
missed file in commit.
configurable update mode:
  var doc = collection.getDocument("Collection/...");
  doc.setUpdateMode(doc.MODE_REPLACE);
  doc.save();

also added new clear method which deletes a single key or clears the
entire document:
  var doc = collection.getDocument("Collection/...");
  doc.clear("key"); // automatically sets updatemode to MODE_REPLACE
  doc.save();
added some basic user management capability
Merge branch 'master' into devel
Merge branch 'master' into devel
Merge branch 'master' of ssh://github.com/dajester2013/CFArango into devel
pull in cf10 fix from master
more acf 10 updates.  note that acf 10 **does not** support sending
PATCH requests, and will be redirected as PUT requests.

this means that document/user updates by default will be REPLACE
operations *only*.