Review Request: When the property gadgets.jsonProxyUrl.maxPostSize is missing from the container.js the default post size ends up being 0 instead of using the default value

[Ryan Baxter]

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https://reviews.apache.org/r/4789/
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Review request for shindig and Dan Dumont.


Summary
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If a container.js is missing gadgets.jsonProxyUrl.maxPostSize the default post 
size will be 0 instead of the actual default size because 
ContainerConfig.getInt returns 0 when the property is missing not null.


This addresses bug SHINDIG-1752.
    https://issues.apache.org/jira/browse/SHINDIG-1752


Diffs
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http://svn.apache.org/repos/asf/shindig/trunk/java/gadgets/src/main/java/org/apache/shindig/gadgets/servlet/MakeRequestHandler.java
 1326802 

Diff: https://reviews.apache.org/r/4789/diff


Testing
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Ran unit tests


Thanks,

Ryan