Add ability to define object parameters via xml elements

[brentonhouse]

See https://jira.appcelerator.org/browse/ALOY-1371 for more details

<Alloy>
  <Collection src="marker" />
  <Map module="ti.map"> 
     <Array parentProperty="annotations" dataCollection="marker">
        <Annotation module="ti.map" />
     </Array>
     <Object parentProperty="region" 
                  latitude="33.74511" 
                  longitude="-84.38993" 
                  latitudeDelta="0.01" 
                  longitudeDelta="0.01" />
  </Map>
</Alloy>

<Alloy>
  <Map module="ti.map">
    <Polygon module="ti.map" parentMethod="addPolygon" />
     <Array parentMethod="addAnnotations" dataCollection="marker">
        <Annotation module="ti.map" />
     </Array>
  </Map>
</Alloy>