Amplitude segment.io integration.
fix for google client id

Realized that `this.name` will be undefined when `common` is called
without context. This means that any GA Universal client ids wouldn't
be respected properly.
Release 1.1.15
amplitude updates
Merging amplitude integration
Release 1.1.16
Replace spaces in properties with underscores for HubSpot
ga: move settings check to enabled
Merge pull request #76 from segmentio/fix/ga-setting-check

ga: move settings check to enabled
Update index.js

Map contiguous spaces in property name to a single underscore.
ga-universal: add .ip and .userAgent override
Merge pull request #77 from segmentio/add/gau-ip-ua

ga-universal: add .ip and .userAgent override
Merge pull request #75 from nextmat/feature/hubspot_snake_case

Replace spaces in properties with underscores for HubSpot
hubspot: be sure to convert all spaces
Release 1.1.17
Merge remote-tracking branch 'upstream/master'