Basic changes to match astropysics update.

Have now backported much of obs site functionality back
to astropysics.
Update readme and convert to ReST.
Add license so others can (officially) use it.
Add new test file
Rewrite to use lxml.objectify.

Because it does exactly what I want from an XML interface.

To do: implement writing of schema compliant VOEvents.
Fix references to ivorn.

alert_response runs now.
Tidy up functionality in AMI module.
Add voevent output.to_string  functionality.
Add Rene to notified list.
Auto import pysovo.voevent with pysovo.
Tighten up integration test
Split VOEvent parsing functionality to separate project.

Also note Astropysics stuff has now been merged upstream.
Merge branch 'master' of git://github.com/timstaley/pysovo

Conflicts:
	.gitignore
	pysovo/address_book.py
	pysovo/alert_types.py
	pysovo/observatories/tests/test_data.py