configure a presubmit to ensure that it stays formatted.
Highlights include:
* simplified import order
* method annotations are now consistently defined on the preceding line
* javadoc reformatted to 100 chars column width
One test that contained line numbers in error messages had to be modified and
the formatter didn't like some of the more complicated preprocessor directives
(MOE and AOP).
To avoid formatting the copyright notices as javadoc i did a preprocessing step to rewrite the initial '/**' to '/*' using perl
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=132694034
