Add "newline then infix-operator" rule

[inamiy]

Examples

-let foo = veryLongBooleanFlag1 &&
-    veryLongBooleanFlag2
+let foo = veryLongBooleanFlag1
+    && veryLongBooleanFlag2

-let foo = flag ?
-     that
+let foo = flag
+    ? this
     : that

-let foo = curry(self.init) <^>
-     arg1 <*>
-     arg2 <*>
-     arg3
+let foo = curry(self.init)
+    <^> arg1
+    <*> arg2
+    <*> arg3