Closes #105: Uncamelcase db_collection_*.

jshint global camelcase can't be removed, however, due to the "res_id"
in the API.
Fix responseLine wrong reference bug.
Closes #102: Move request helpers to util.
Add request creation tests.

Also, fix a bug in keepAlive using the incorrect shell reference (was
this).
Correct indentation on keepAlive.

Also remove unnecessary dataType param.
Complete request.createMWSResource test.
Make a few comments more accurate in main code.
Add thorough dbCollectionFind tests.
Add db.collection.insert tests.
Merge pull request #111 from mcomella/test_request

Add request module tests.