Test new Travel Sample for C

Please test the new travel sample.  The goal is to run through it as a user would.  If you encounter things that are simple to fix, simply fix them with a change on the feature branch for the travel sample, either docs or code.  If it affects the structure substantially, please get with Tyler or file an issue.

Note that the travel sample docs are in a feature branch on docs-cb4, and the code is either merged to master or in a separate branch.