Currently building Angular Material with gulp inside of directories that include spaces, does not work because `child_process.spawnSync` does not properly treat the whole path as binary and just considers everything after the first space as command line argument.
We can fix these issues by ensuring that the binary is always located in the working directory. Also we would need to make sure that we wrap all `child_process` arguments with explict quotes because otherwise NodeJS would treat them as individual arguments (e.g. `path/to/my project/ -> ["path/to/my", "project"])
--
**TL;DR**: As this is just too much work for something we will eventually replace with Bazel, we are just printing an error message.
* build: separate demo-app in its own directory.
* chore: replace gulp-inline-resources with a script
This also improves upon the relative path problem. All template paths
now should be relative. Also, we can now include double-quotes in
CSS/HTML.
Paul Gschwendtner