Enable lookup of ids

Thanks @Cosrnos!
#26

v1.3.0

• Adds getCriteriaValues for querying criteria values as full objects.
• Adds getCriteriaValueId for querying criteria values and returning the first id.
• Deprecates getCriteriaValue for querying criteria values and returning the first id.

First public release

Starting at this commit we've moved from a private npm module hosted under @spanishdict to a public npm module.

The only substatial change is:

• Updated node-google-dfp to 0.2.1

All other changes are detailed in CHANGELOG.md