PulsePoint Lite adpater changes (#1630)

* ET-1691: Pulsepoint Analytics adapter for Prebid. (#1)

* ET-1691: Adding pulsepoint analytics and tests for pulsepoint adapter

* ET-1691: Adding pulsepoint analytics and tests for pulsepoint adapter

* ET-1691: cleanup

* ET-1691: minor

* ET-1691: revert package.json change

* Adding bidRequest to bidFactory.createBid method as per #509

* ET-1765: Adding support for additional params in PulsePoint adapter (#2)

* ET-1850: Fixing #866

* Minor fix

* Refactoring current functionality to work with bidderFactory (for 1.0 migration)

* More tests.

* Adding support for "app" requests.

* fixing eslint issues

* adding adapter documentation

* minor doc update

* removing usage of reserved keyword 'native'