Optionally pass in 'html' template function to Accounts email templates
Tests for the html option to email templates
history note for #1785
Merge branch 'pr/1785' into devel
Use 'self', since we have it declared
no need for `loginHandlers` to be global
remove trailing comma
Better error for new Meteor.Collection({})

Fixes #1879.
Update Google oauth scopes. The previous ones were deprecated.
Some docs tweaks

- get rid of the sole use of "attribute set"
- add some links
- add missing "the"
Clearer docs on avoiding initial changed() calls

Explain `initializing` specifically, and move the comments closer to its
definition.
Document one-Collection-per-collection rule