Simplify the runtime.connect generic signatures.

Reviewers: O2 Material Motion, O4 Material Apple platform reviewers, #material_motion, chuga

Reviewed By: O4 Material Apple platform reviewers, chuga

Tags: #material_motion

Differential Revision: http://codereview.cc/D2830

src/MotionRuntime.swift

@@ -46,12 +46,8 @@ public final class MotionRuntime {
     viewInteractions.append(interaction)
   }
 
-  public func connect<T, P: ReactivePropertyConvertible>(_ stream: MotionObservable<T>, to property: P) where P.T == T {
-    write(stream, to: property.asProperty())
-  }
-
-  public func connect<T, P: ReactivePropertyConvertible>(_ fromProperty: ReactiveProperty<T>, to property: P) where P.T == T {
-    write(fromProperty.asStream(), to: property.asProperty())
+  public func connect<O: MotionObservableConvertible>(_ stream: O, to property: ReactiveProperty<O.T>) {
+    write(stream.asStream(), to: property)
   }
 
   public func enable(_ interaction: TogglableInteraction, whenAtRest otherInteraction: StatefulInteraction) {