Attempt to fix #20

[NoahAndrews]

I expected this PR to fix a file's dependencies not getting re-evaluated when it's compiled, but as of now it does not. Any guidance is appreciated, though I can't guarantee that I'll have the time or motivation to come back to this PR. If someone else has time to work on this, feel free to make a new PR that includes my changes.

This PR does a couple of things:

• Stops caching typescript compilation results
  • I did this because caching is currently done based on the mtime of a single file, when compilation of a given file is actually the result of not only itself, but all of the files that it imports.
  • Typescript compilation results can be cached again once @isaacs/cached supports caching results based on an array of files, instead of just one.
  • I did not expect this change to fix the specific issue described in Adding an export in one file and using it from in another requires a daemon restart #20
• Queries the dependencies of the file being compiled using ts.preProcessFile(), and calls updateFileVersion() on each one
  • I was surprised to find that this did not fix the issue.