Adds oauth1 improves to support requestTokenSecrets & dynamic urls.

Atmosphere package: https://github.com/RobertLowe/meteor-accounts-trello

Fixes #1167
Closes #1227
Adds documentation for `config` arg of `OAuth1Binding`'s constructor

Context: https://github.com/meteor/meteor/pull/1253#commitcomment-3980200
Cleanup. Whitespace, comments, style, unused variables.
add history.md note
Merge branch 'pr-1253' into devel