Merge pull request #1 from twhiteaker/master

Repaired broken link to download-icon.png by renaming it. Added global v...
Merge pull request #2 from twhiteaker/master

Clean up CSS, Set Initial Extent
Generalized search for WML2 observation

wml2:observationMember and wml2:Collection may not exist in a WaterML 2
file, depending on the service. These were replaced with
om:OM_Observation.
Replaced DataProvider field with Source

Field name in World Water Online map services changed from DataProvider
to Source, causing the query to fail.
Skip points without data, recognize additional date format

Some WaterML files have points with no time/value pair. These are now
skipped. Added recognition for "yyyy-mm-dd" format.
Expanded URL Parameter capabilities

Viewer now accepts the following URL Parameters:
xmin, xmax, ymin, ymax: follow rules of ESRI extent object
chartTitle: string
featureService: URL as string (can have multiple instances)

Have not tested featureService strings which require URI Encoding.
Deleted extraneous files

These files were created by Dreamweaver and are not required.
Add examples for initialExtent