changes around issue #3

[nlac]

…ckage-lock.json)

• removed packaging itself as an external node module
• fixed async warning dropping by fs
• fixed issue #3 (diff calculated wrong)
• modified expected test results where the calculated patch is equivalent (now only 1 fails)
• added comments to almost every change
• the code formatting is a mess, but i've left it as it is to compare more easy - proper tabulating required