Corrected link to the Emitter documentation

The link in the Game Object drop-down was refered to a non-exisnant type.
This also changes it from "Emitter" to "Particle Emiter" for clarity of
intent with Particles.
ScaleManager documentation updates

- Clarified proper usage of `pageAlignVertically` and add note about 2.2
  change and how to obtain 2.1 behavior.

- Removed the `@readonly` status of the `parentIsWindow` and `parentNode`;
  these can be updated in a controlled manner.

- Added intra-hyperlinks

- Updated some ancillary documentation
Fixes issue where Pixi CanvasTint didn't allow for browsers that bit-shift the alpha value on putImageData (Android Stock Browser, I'm looking at you!)
readme update.
A test to try for #1424
Moved the updateTransform to a Game level update on Stage and replaced the Pixi version.
Added a boolean check, so it can be either updated from updateLogic or render without duplicating the process.
#1424
Merge pull request #1427 from pnstickne/wip-1426-emitter-docs

Corrected link to the Emitter documentation
Merge pull request #1428 from pnstickne/wip-1422-vertical-align

ScaleManager documentation updates
TilemapParser: fixed check for image collection
Merge pull request #1440 from paul-reilly/dev

TilemapParser: fixed check for image collection