WebMapJS ignores defaultProjection from config file

[jpulles]

File WMJSMap.js uses fixed values for setting initial srs and bounding box, where it could have used the values for the default Projection in the config file.

WMJSMap.js, lines starting at 694:

    this.bbox.left = -180;
    this.bbox.bottom = -90;
    this.bbox.right = 180;
    this.bbox.top = 90;
    this.srs = 'EPSG:4326';

These values could be taken from a configured defaultProjection:

var defaultProjection = {
	bbox: '-5000,300000,300000,630000', 
	srs: 'EPSG:28992'
};