fix(local): allow limited customization of local installation

closes #206
- allow url, process name, and the db info to be supplied via the command line

lib/commands/setup.js

@@ -21,11 +21,16 @@ module.exports.execute = function execute(options) {
     };
 
     if (options.local) {
-        options.url = 'http://localhost:2368/';
-        options.pname = 'ghost-local';
+        options.url = options.url || 'http://localhost:2368/';
+        options.pname = options.pname || 'ghost-local';
         options.process = 'local';
-        options.db = 'sqlite3';
-        options.dbpath = path.join(process.cwd(), 'content/data/ghost-local.db');
+
+        // If the user's already specified a db client, then we won't override it.
+        if (!options.db) {
+            options.db = options.db || 'sqlite3';
+            options.dbpath = path.join(process.cwd(), 'content/data/ghost-local.db');
+        }
+
         context.start = true;
 
         // In the case that the user runs `ghost setup --local`, we want to make