#159 context support for pageview api
added vwo
#160 Added tests to pageview api for allowing context
user: remove trailing comma
release: 0.11.3
intercom: updated library url
release: 0.11.5

Adding dependency for segmentio/json instead of component/json until
we add .optional to the builder.
Updating segmentio-json
Added tapstream as an analytics.js provider
fixing usercycle identify and track implementations
updating usercycle test and building
add Preact group support
updating vero javascript cdn url
merged in new vero cdn
merged in usercycle fixes
Merge branch 'master' of https://github.com/devangpaliwal/analytics.js
merged #160
fix non-existant providers breaking, fixes #178
fix bug with created date for userfox
preact: merge group support