Use process.env.xtcDev when requiring xtc. Don't mask startup errors.
Move the Handlebars helper Hipsum.js to project dependencies.

- Hipsum is registered and thus documented/discoverable at the project level.
- But let Travis install it before running tests (without project!)
Remove the xtc-cli usage hints from the project generator. This should be handled by xtc-cli itself.
Update terrific-extensions.js (better error handling for bindAll)
Fix module and skin generators: use configure.getRaw()