Deploy REST API options correctly

[dmcassel]

REST API options need to be deployed under /<group-name>/<appserver-name>/. Right now, you can do that by storing the the options in a directory that matches the intended group and appserver name, but if that's different on different environments, it breaks.

Solution:

• have options live in a separate directory (not under src)
• have a rest-options-dir property
• if app-type is "rest" or "hybrid", deploy the contents of the rest-options-dir to /<group-name>/<appserver-name>/.

[dmcassel]

Fixed. Also added a "group" property to default.properties, though this feature is the only place where it's used (so far).