Fix title underline.
Add logo to vultr driver docs page.
Add t2 nodes to us-west-1 region in the EC2 driver.

Closes #388

Signed-off-by: Tomaz Muraus <tomaz@apache.org>
CLOUDSTACK: Add option to expunge vm on destroy

Signed-off-by: Sebastien Goasguen <runseb@gmail.com>

This closes #382
LIBCLOUD-634 Cloudstack: get template size in list_images extra attributes

Signed-off-by: Sebastien Goasguen <runseb@gmail.com>

This closes #389