Upgrade to JUEL 2.1.2

[awiner, 2009-06-17 21:26:44]

Upgrade to JUEL 2.1.2
- Uses Ian Boston's temporary upload of JUEL 2.1.2 to a maven repos, thanks Ian!
- Fixed boolean coercion to comply with the Opensocial spec
- Centralized Iterable and JSONArray coercion to no longer be gross hacks
- Stopped using default caching;  instead use CacheProvider.  Expression trees
are now cached using the LRU or ehcache caches, and can be configured
accordingly.
- Got rid of default constructor of Expressions (only useful for testing); 
added Expressions.forTesting() method to access the same thing.

[levik, 2009-06-17 22:18:48]

http://codereview.appspot.com/74075/diff/1/8
File
java/common/src/test/java/org/apache/shindig/expressions/ExpressionsTest.java
(right):

http://codereview.appspot.com/74075/diff/1/8#newcode174
Line 174: }
What about the string "0"? What should that do?

[awiner, 2009-06-17 23:29:55]

http://codereview.appspot.com/74075/diff/1/8
File
java/common/src/test/java/org/apache/shindig/expressions/ExpressionsTest.java
(right):

http://codereview.appspot.com/74075/diff/1/8#newcode174
Line 174: }
On 2009/06/17 22:18:49, levik wrote:
> What about the string "0"? What should that do?

The same thing it does in Javascript - coerce to true.

OTOH, the string "false" doesn't coerce to false in JS, so I could be pushed to
either:
  - Make "0" -> false
  - Or make "false" -> true
  - Or just leave things as they are

The current state is a bit inconsistent.