Fixed issue with promise while using checkout 'log' + added meteorJs packaging

[CyrilSabbagh]

• I fixed issue https://github.com/snapjay/ngCart/issues/46.
• Added packaging for meteor !! Plugin now available on the community : https://atmospherejs.com/cyrilsabbagh/ng-cart

[snapjay]

Looks good; but please keep the meteor as a separate PR; these are different issues