Add more badges to the readme.
adding coreos and opensuse to GCE images

Closes #340

Signed-off-by: Tomaz Muraus <tomaz@apache.org>
Support GCE LB session affinity

Add support for sessionAffinity to the GCE Load Balancer driver.
sessionAffinity has the effect of causing clients to "stick" to a
particular backend server.

Also, trivial documentation fixes:

  * resolve ambiguous type specification in create_balancer
  * fix typo in development doc

Closes #341

Signed-off-by: Tomaz Muraus <tomaz@apache.org>
Add SSD support to GCE Compute driver

Closes #339

Signed-off-by: Tomaz Muraus <tomaz@apache.org>
Also run Python 3.4 on travis.
Remove duplicated file.
Add two new default node states:

- NodeState.SUSPENDED
- NodeState.ERROR
Add new driver for VMware vSphere.
Add ex_get_resource_pool_name and ex_get_resource_pools method to the
vSphere driver.
Update vSphere driver to use VM UUID as Node id instead of using VM's path.
Include more attributes in the extra dict of vSphere Node object.
Fix an issue with LIBCLOUD_DEBUG not working correctly with the
Linode driver.

Closes #342
docs: Update committer guide.
Add ex_clone_node method to vSphere driver.
Add ex_migrate_node method to the vSphere driver.
Update docstrings.
Update vSphere docs.
Update tox docs target dependencies.
Add more extension methods to the vSphere driver.
Add list_images method to the vSphere driver.