[WIP] Configure compiler with tsconfig.json

[kitsonk]

Fixes #51

This PR add support for configuring the compiler via a tsconfig JSON via specified via the -c or --config command line arguments.

The tsconfig is read in and processed so that any options in the compilerOptions values that would interfere with Deno or are meaningless in a Deno context are ignored. A warning will be logged to the console indicating any ignored options.

Example of the flag usage and output:

$ ./out/debug/deno tests/002_hello.ts
Hello World
$ ./out/debug/deno tests/002_hello.ts --config tsconfig.json
Unsupported compiler options in: "tsconfig.json"
  The following options were ignored:
    baseUrl, module, moduleResolution, noLib, paths, pretty, types
Hello World
$ ./out/debug/deno tests/002_hello.ts --config bad.json
Specified configuration "bad.json" not found.

I think it is functionally complete but does not have all the tests.

[kitsonk]

@ry this is ready for review. Will squash once I have incorporated any feedback. I will also add some unit tests for the compiler.configure().

[kitsonk]

Closing for now, as this will need to be re-worked once the compiler infrastructure is refactored.