Add bikes_allowed attribute to trip entity hibernate configurations

[RanAbram]

Summary:

The bikes_allowed attribute already introduced for the trip entity in the past, but it seems that this field not being parsed as part of the hibernate import. The field is part of the GTFS spec and can be found here. This PR should fix that.

Expected behavior:

When using the hibernate GtfsDatabaseLoaderMain we are expecting to get the bikes_allowed field to the gtfs_trips table.

Please make sure these boxes are checked before submitting your pull request - thanks!

• [ ] Run the unit tests with mvn test to make sure you didn't break anything
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[RanAbram]

Hi @jeffmaki @sheldonabrown , How are you doing?

I could see that lately you merged couple of new PRs into master. For that reason, I was wondering if there's any chance that you could please review my PR as well?

Thanks!