support secret/secret_file in knife.rb

Fixes KNIFE-398
Merge pull request #64 from reaperhulk/master

[KNIFE-398] Support secret_file/secret in knife.rb
Add --ssh-keypair for using ssh keys already registered with nova.
Merge pull request #66 from hughsaunders/rackspace_keypairs

[KNIFE-420] Add --ssh-keypair for using ssh keys already registered with nova.
fixing broken flavor tests caused by a change in the available flavors on the Rackspace Cloud
Merge branch 'master' of https://github.com/opscode/knife-rackspace
trying to force travis to rebuild
fix warning from rspec
rerecord cassettes, clearing out old data
Merge pull request #68 from maxlinc/cassettes

Cassettes
replace static.cloud-ips with xip

cloud-ips.com has be depreciated - https://community.rackspace.com/general/f/34/t/623

use xip.io instead which will give working hostnames.
Merge pull request #69 from paulczar/swap_dns_suffix

replace static.cloud-ips with xip
[KNIFE-437] remove default region and make region required
Merge pull request #70 from rackspace/KNIFE-437

[KNIFE-437] remove default region and make region required
[KNIFE-437] Re-implementation of removing the default region. This version takes into account the knife.rb file.
Merge pull request #72 from rackspace/KNIFE-437

[KNIFE-437] Re-implementation of removing the default region.
[KNIFE-437] Re-implementation of removing the default region. This version takes into account the knife.rb file.
Update README.rdoc

Added some clarification for the new "performanceX-X" machines.
Merge pull request #73 from jjasghar/patch-1

Update README.rdoc