Merge pull request #4 from twhiteaker/master

Add examples for initialExtent
Fix for Issues #6, 9, and 10

Put wmlviewer files in separate folder.
Added wmlviewer-config.js to centralize configuration options.
Added wmlviewer-init.js to reduce script code in HTML
Modified wml-chart.js and wml-property-library.js to recognise units
used by NLDAS Soil Moisture
Added NASA service to proxy.config
Fixed unknown units from USGS
Honor transparency set by map service