[boost] [1.35.0] Release branch snapshots

The first attempt at a release branch snapshot is now available. See http://beta.boost.org/development/testing.html#Snapshots for more information, and a link to the actual files. Thanks to Martin Wille for setting up the hosting! The plan is to automatically build Unix and Windows snapshots on a daily basis. Right now the only snapshot available is a .zip with Windows line endings. For the moment the focus is simply getting the build process in place for both Unix and Windows. Once that is running more or less smoothly, the focus can shift to making sure the content is all there, and that other QA checks are being met. --Beman