Inject gadgets.config into javascript servlet output for container output

The Js servlet supports a container param without a way to inject container specific configs.  Adding this code allows one to configure container side portion of the code.

With some work this could also allow one to run gadgets.config code inside the js servlet output instead of the iframe.

[Paul Lindner, 2010-04-26 21:18:00]

any comments?

[henry.saputra, 2010-04-26 21:42:59]

Should we include the dependencies features to check for the container config?

http://codereview.appspot.com/992043/diff/1/2
File
java/gadgets/src/main/java/org/apache/shindig/gadgets/servlet/JsServlet.java
(right):

http://codereview.appspot.com/992043/diff/1/2#newcode141
java/gadgets/src/main/java/org/apache/shindig/gadgets/servlet/JsServlet.java:141:
for (String name : needed) {
Should we also get the config for the transitive dependency features?

If we do then we I think we need to call registry.getFeatures(needed) to get the
list of features requested that include the transitive dependencies feature
names.