coerce: allow arrayOk and valType: 'any'

* This change is needed so that the attribute `base` in bar traces can
  accept `number` and `Date` values.

Author: n-riesco

src/lib/coerce.js

@@ -228,7 +228,7 @@ exports.valObjects = {
     any: {
         description: 'Any type.',
         requiredOpts: [],
-        otherOpts: ['dflt', 'values'],
+        otherOpts: ['dflt', 'values', 'arrayOk'],
         coerceFunction: function(v, propOut, dflt) {
             if(v === undefined) propOut.set(dflt);
             else propOut.set(v);