Add symbol references for types referenced in jsdoc.

The symbol table is created from dotted names, not fully qualified names.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=43852550
Fixed the JsDocInfoParser to parse the documentation associated with @define tag. Currently the @define tag does not have any description associated with it. This CL fixes that.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=43877942