Merge pull request #4 from AppScale/testing

sync with main branch
clarified error message on appscale clean in cloud env
Merge pull request #198 from shatterednirvana/appscale-clean

clarified error message on appscale clean in cloud env
Merge pull request #6 from AppScale/testing

sync with main branch
fixed abs paths issues when deploying a .tar.gz app
merged back deleted code
unit test for relative path fix"
Merge pull request #199 from briandrawert/fix-abs-path-deploy-2

Fix abs path issues when deploying tar.gz files
fixed sending over spot instance price when automatically set, and updated unit tests
Merge pull request #200 from shatterednirvana/specify-spot-price-flag

fixed sending over spot instance price when automatically set, and updated unit tests