Merge pull request #8 from Islandora/7.x

update 7.x
simple at-a-glance verification of drupal filter writability
Merge branch '7.x-filter_drupal_is_writeable' of https://github.com/qadan/islandora into 7.x-filter_drupal_is_writeable
oh qadan you goof
doing this the less stupid way
let's just do this right
datastream entity
Merge pull request #555 from willtp87/7.x.datastream_entity

datastream entity
Basic implentation of other hooks and XPath Rules condition.
forgot you can't just run the parent run()
Merge branch '7.x' of https://github.com/Islandora/islandora into 7.x-filter_drupal_is_writeable
coder issues
accidental reversion of features
accidental reversion of even more features
will the accidental reversions never end
Somewhat further.

Have a one-off and the ability to query, iterate and set values of
multiple nodes in XML in one shot.
Going to add some temporary "entity" implementation.
Fix setting of properties and flesh out comments a bit.
Adjust string.
Add "state" property to datastreams.
Add ability to specify context nodes when XPathing.