Changes the way ":" is added to sqlite db paths (#270)

1. Only add on win32 platforms
2. Only add if host is a letter

The only case this can't avoid (right now) is realtive paths where the
first folder is a letter. Please avoid it.

lib/Drivers/DML/sqlite.js

@@ -14,7 +14,11 @@ function Driver(config, connection, opts) {
 		// on Windows, paths have a drive letter which is parsed by
 		// url.parse() as the hostname. If host is defined, assume
 		// it's the drive letter and add ":"
-		this.db = new sqlite3.Database(((config.host ? config.host + ":" : "") + (config.pathname || "")) || ':memory:');
+		if (process.platform == "win32" && config.host.match(/^[a-z]$/i)) {
+			this.db = new sqlite3.Database(((config.host ? config.host + ":" : "") + (config.pathname || "")) || ':memory:');
+		} else {
+			this.db = new sqlite3.Database(((config.host ? config.host : "") + (config.pathname || "")) || ':memory:');
+		}
 	}
 
 	this.aggregate_functions = [ "ABS", "ROUND",