Doc:  Remove old versions for consistent behavior

If you have older versions of the gem also installed, this causes the
"v2" functionality to be flakey.  (From IRC with Matt Ray, tested by
me)  

Included warning and command examples to show how to check and remedy 
this situtation.
Added multi region support; removed default endpoint as it should come from the service catalog; updated to require fog 1.10.1
KNIFE-312 updated to display region warning for version 1 of the Rackspace API
KNIFE-312 adding version debugging information
Merge pull request #29 from behemphi/master

Update doc for mulitiple knife-rackspace gem version issue and fix.
KNIFE-312 changing rackspace_endpoint to rackspace_compute_url; auto detect correct authentication endpoint for region
KNIFE-312 updating vcr cassettes
KNIFE-312 removing ruby 1.8.7 from travis build as winrm support requires ruby 1.9.3; updating vcr cassettes.
KNIFE-314 fixed first gen server provisioning
Merge pull request #52 from rackerlabs/KNIFE-314

KNIFE-314 fixed first gen server provisioning
disable endpoints
bump fog version
fix rackspace_auth_url and remove rackspace_endpoint for KNIFE-315
update CHANGELOG with KNIFE-314
KNIFE-315 merge
KNIFE-312 merging in latest master
Allow option to pass disk_confg to fog for new server creation

Also take care of some whitespace and cleanup tags while I'm in
Fixup missing comma so this will actually work
documented the --rackspace-disk-config option
update changelog