Update release notes for CloudStack driver.

Signed-off-by: Tomaz Muraus <tomaz@apache.org>
docs: Split lines on 80 columns.
Fix a bug in EC2 driver - ensure it works correctly if user passes an int for
ex_mincount or ex_maxcount kwarg.

Reported by Frederic Michaud, part of LIBCLOUD-410.
pep8 fixes in the ec2 test file.
Fix EC2 test so it doesn't depend on query param ordering in the URL.
Move Joyent compute driver to a single class + region argument model.
docs: Update upgrade notes.
docs: Fix a typo.
Document argument type in the ec2 driver.
Update CHANGES.
Revert some changes so I can apply patch cleanly.
Modify ElasticHosts driver to take region argument (w.i.p.).

Signed-off-by: Tomaz Muraus <tomaz@apache.org>
Use super instead.
Pep8 fixes.
Re-apply reverted changes and more progress on region support in elastichosts
driver.
ElasticHosts compute driver: Use region names exposed by the provider.
Add tests for the new region functionality in the ElasticHosts driver.
Indicate which constants have been deprecated.
Use unittest2.
Update CHANGES.