Buildbot-travis

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- Add a ``nextBuild`` handler that stops there being spawner builds without
runner capacity.

- Add some default ignores.

- Use SingleBranchScheduler / AnyBranchScheduler

- Show pending builds in web ui.

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- Fix unskinned 'building' view on ``/projects/wibble/`` url handler.

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- Brown paper bag release.

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- The pollers are now named - this allows them to be triggered by a change
hook.

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- SVN poller configuration is subclassable

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- Custom MailNotifier that makes use of .travis.yml