added new --use_spot_instances flag to run-instances, and changed ec2_agent to use it to use spot instances instead of on-demand instances
added flag to let users manually specify a maximum spot instance price, as opposed to letting us automatically pick one
Merge pull request #3 from AppScale/testing

Testing
passing along spot flag to appcontroller, so that it can send it to the iaas manager
Merge branch 'spot-instances-flag' into specify-spot-price-flag
passing along max spot price to appcontroller, so that it can send it to the iaas manager
added unit tests for spot instance usage
fixed previously commented out test
Merge branch 'spot-instances-flag' into specify-spot-price-flag
added unit test for manually specifying spot price, and fixed code that used the automatically generated spot price
code cleanup
Merge branch 'fix-ssh-quotes' of github.com:briandrawert/appscale-tools into fix-ssh-quotes
fixed error message
fixed error message
str'ing max_spot_price so that it doesn't end up as None if not set
made error message prettier
more revision to the error messages
Merge pull request #184 from shatterednirvana/ec2-env-var-not-found-msg

made error message prettier
clean up
removed leading colon from ips.yaml tags