Rename subscribeOn to evaluateOn
Rename `on` block from `subscribed` to `started`
Remove subscriber terminology from ColdSignal docs
Remove subscriber terminology from other docs
Remove “Differences from Rx” document

Resolves #1484.
Clarify that RAC is inspired by Rx, not based upon
Merge pull request #1623 from ReactiveCocoa/remove-differences-from-rx

Remove “Differences from Rx” document
Make file, function, and line properties internal

Consumers shouldn’t really need these, it’ll pollute any published
documentation, and we shouldn’t need to worry about backwards
compatibility for them.
Merge pull request #1626 from ReactiveCocoa/make-debugging-internal

Make file, function, and line properties internal
Merge pull request #1614 from ReactiveCocoa/action-tests

Action tests
Merge branch 'swift-development' into kill-subscription-terminology

Conflicts:
	ReactiveCocoa/Swift/Action.swift
Merge pull request #1622 from ReactiveCocoa/kill-subscription-terminology

Remove references to “subscribers” and “subscription” from Swift APIs
Merge remote-tracking branch 'origin/swift-development' into improve-actions

Conflicts:
	ReactiveCocoa/Swift/Action.swift