handling of another possible error case. I encoutered an error like this when using invalid credentials
don't pass 'identifier' data when there is no tunnel
Update README.md
Delete .project
Added build param to the docs
Merge pull request #101 from spenceralger/patch-1

Added build param to the docs
Print warning if tunneled url contains an unsupported port

Not all ports are proxied by Sauce Connect. Show a warning if port is
not in this list: https://saucelabs.com/docs/connect#localhost
Print warning in yellow to stand out
Merge branch 'incoming-pr' of github.com:axemclion/grunt-saucelabs into incoming-pr