Set a default SERVER_PORT variable (issue1733043)

[lindner]

Reviewers: dev-remailer_shindig.apache.org,


Please review this at http://codereview.appspot.com/1733043/show

Affected files:
  M config/container.js
  M  
java/common/src/main/java/org/apache/shindig/common/PropertiesModule.java
  M  
java/common/src/main/java/org/apache/shindig/config/JsonContainerConfig.java
  M  
java/common/src/test/java/org/apache/shindig/config/JsonContainerConfigTest.java
  M  
java/gadgets/src/test/java/org/apache/shindig/gadgets/servlet/ConcatProxyServletTest.java
  M  
java/server/src/test/java/org/apache/shindig/server/endtoend/EndToEndServer.java
  M  
java/social-api/src/test/java/org/apache/shindig/social/SocialApiTestsGuiceModule.java