WFS Format Doesn't Call Cross-Browser XML Methods

[tcoulter]

Put bluntly, the WFS format doesn't work in IE. See the change log here: r5775

[crschmidt]

The revision in question is changed significantly from trunk. This patch *just* changes the document.createElementNS methods to this.createElementNS methods.

[tschaub]

Based on a visual review, I'd say this should go in. Any volunteers out there interested in writing tests? The WFS format could use some.

[crschmidt]

(In [5868]) Change the Format.WFS to use Format.XML methods instead of document.createElementNS methods. r=tschaub. (Closes #1278)

[sbenthall]

write() needs to return a string

[sbenthall]

makes write() return a string. Also, does a little remaining document --> this

[crschmidt]

(In [6054]) Add further improvements to WFS writing code from sbenthall, to write out things in IE. (Closes #1278) (again)