Ingest https://codereview.appspot.com/9264043/

Stop including parens and exclamation points in linkification.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=46401741
Add a factory class to support the default transport implementation.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=46435021