Bump API version used by EC2 driver to 2013-10-15 and update affected test
fixtures.
Add ex_get_limits method to EC2 driver.
Update CHANGES.
Update us-west-1 region in the EC2 driver to include c3 instance types.
Also include pricing information.

Reference: https://twitter.com/awscloud/status/412873932828442624
Update CHANGES.
Update CHANGES file to use a more consistent style. This way file can more
easily be processed automatically by different tools.
Update CHANGES.
Add a script for generating a Markdown formatted list of contributors from the
CHANGES file.
LIBCLOUD-439: Be consistent with other drivers and use underscores in the extra
dictionary attribute names.
Call title on the contributor name so all the names follow the same format.
Update CHANGES.
Modify lint target to also lint files in contrib/.
For convenience, add ex_create_port_forwarding_rule and
ex_delete_port_forwarding_rule method to the CloudStackNode class.

For consistency, also rename "ex_add_ip_forwarding_rule" to
"ex_create_ip_forwarding_rule".

Signed-off-by: Tomaz Muraus <tomaz@apache.org>
To make it more clear, use keyword arguments.
Update CHANGES.
Use consistent docstring format.
Use sphinxcontrib.fulltoc sphinx extension.
Fix dependency name.
docs: Add a missing section, fix some formatting issues.
docs: Fix a bunch of build warnings.