Added retreival of additional metadata from image pool

(cherry picked from commit 45fa8d0269ff02752e48b921c400ad433937f6ba)

Conflicts:
	cloud_bdii/providers/opennebularocci.py
Description is optional

Description is an optional parameter. Do not update it if it does not exist.

(cherry picked from commit f1281bb59f10e0c2bf62db27aea155791bb13523)

Closes issue #7
Conflicts:
	cloud_bdii/providers/opennebula.py
	cloud_bdii/providers/opennebularocci.py
Fixed generation of OCCI ID according to rOCCI rules

Closes bug #6

(cherry picked from commit 25eb087af085853f9eef1696bda58a679bcf0f2c)

Conflicts:
	cloud_bdii/providers/opennebularocci.py
Added possibility to setup resource_tpl and os_tpl schema

Added the possibility to setup, for the OpenNebula driver, custom resource_tpl
and os_tpl resources schema. Resource_tpl schema is also taken by default from
the rocci configuration.

(cherry picked from commit 7bf52eb0586c3b7bd0cc68732118389c4a216588)

Conflicts:
	cloud_bdii/providers/opennebula.py
	cloud_bdii/providers/opennebularocci.py
Fix rOCCI ID build rules

Closes #8 (Thank Boris)
(cherry picked from commit 3dcee594ac521fb49ba4c4e56ff84d4194d0f1d8)
Bump to version 0.3

(cherry picked from commit c14cd43a2b853c9f4deea4ed500791786c380dfc)