Move files around for more logical organization.

(index -> bin/cli_tool).js, package.json
	-`index.js` was developed as a command-line tool, and thus:
		-belongs in `bin/`
		-should be specified in `package.json`'s `bin` property.

(lib/converter -> schema-mapper).js
	-Move the `converter` module to the package root and rename it
	after the package itself, as it'll serve as the main entry point
	for other Node modules.
Fix require() paths, update package.json entry pt.

bin/cli_tool.js, schema-mapper.js
	-Fix the module's `require()` paths, which were broken after
	they were moved around in 61a3cc1.
Merge branch 'feature/cli' into develop

(index -> bin/cli_tool).js, (lib/converter -> schema-mapper).js
	-Move around the package's modules such that it can be used as
	both a command-line tool, and an interfaceable package in other
	projects.