Add development pom.xml

Motivation
----------
While ivy/ant works for years now, it is a little too hard to get
started when contributing simple patches with IDE setup. Since most
IDEs have good maven support, adding a pom.xml to get up and running
quickly makes it easier to contribute and develop.

Modification
------------
Add a pom.xml which is inteded to get up and running quickly. It is not
designed to do release management, which still happens through the
ant/ivy pipeline.

Result
------
Contributors and developers can import the project more easily and
contribute patches.

Change-Id: I40831905d61d263522e006774faecca9534e31e2
Reviewed-on: http://review.couchbase.org/34853
Reviewed-by: Michael Nitschinger <michael.nitschinger@couchbase.com>
Tested-by: Michael Nitschinger <michael.nitschinger@couchbase.com>