Loosen strictness of Uri parsing for Proxy and Concat managers (issue434044)

[johnfargo]

Reviewers: zhoresh, shindig.remailer_gmail.com,


Please review this at http://codereview.appspot.com/434044/show

Affected files:
   
java/gadgets/src/main/java/org/apache/shindig/gadgets/uri/DefaultConcatUriManager.java
   
java/gadgets/src/main/java/org/apache/shindig/gadgets/uri/DefaultProxyUriManager.java
   
java/gadgets/src/test/java/org/apache/shindig/gadgets/uri/DefaultConcatUriManagerTest.java
   
java/gadgets/src/test/java/org/apache/shindig/gadgets/uri/DefaultProxyUriManagerTest.java