* [control file] Add optional 'Homepage' tag
This allows a 'Homepage' tag to be added to a port in order to support
changes such as PR #2933. It currently does not do anything with it.
* [docs]
Add Homepage to the control file documentation
* move urls from descriptions to homepage field.
* Updates 2019.03.29
* Undo changes to 4 ports(rocksdb tbb thrift uwebsockets) due to failures
* [folly] Fix target files in debug mode
* Undo glog changes since it caused sophus openmvg and cartographer failures
* Undo Folly changes since it cause wangle failed
* Undo Folly portfile