Use wget to grab http webapp resources remotely when deploying

Conflicts:
	software/webapp/src/main/java/brooklyn/entity/webapp/JavaWebAppSshDriver.java
handle files beginning with the string http and uppercased protocols, and check wget is installed first
Changed wget to curl
Merge pull request #511 from grkvlt/wget-http-remote-rebased

Use wget to grab http webapp resources remotely when deploying