Improving azure site --location option

Don't prompt for location when provided
Map provided location from matching display name to webspace name

lib/cli/commands/site_.js

@@ -151,8 +151,24 @@ exports.init = function (cli) {
             
             function promptForLocation(_) {
                 log.silly('promptForLocation');
+                
                 var spaces = site.doSpacesGet(context, _);
 
+                if (context.site.webspace !== undefined) {
+                    // Map user-provided value to GeoRegion display name, if unique match exists
+                    var displayNameMatches = spaces.filter(function(space) {
+                        return space.GeoRegion === context.site.webspace;
+                    });
+                    if (displayNameMatches.length === 1) {
+                        context.site.webspace = displayNameMatches[0].Name;
+                    }
+                }
+
+                if (context.site.webspace !== undefined) {
+                    // Don't prompt if location has been inferred or provided
+                    return;
+                }
+
                 if (spaces.length === 0) {
                     log.help('You must create your first web site using the Windows Azure portal.');
                     log.help('Please follow these steps in the portal:');