Fix JavaScript warnings

This PR will fix following JS warnings.

```
[master][~/Developments/JavaScript/jquery.depend]$ jsl -process src/jquery.depend.js                                                                                                                                    rbenv:2.0.0-p247
JavaScript Lint 0.3.0 (JavaScript-C 1.5 2004-09-24)
Developed by Matthias Miller (http://www.JavaScriptLint.com)

jquery.depend.js
/Users/ryutaro/Developments/JavaScript/jquery.depend/src/jquery.depend.js(287): lint warning: missing semicolon
        var architecture = ''
........^

/Users/ryutaro/Developments/JavaScript/jquery.depend/src/jquery.depend.js(288): lint warning: missing semicolon
        var version = null;
........^

/Users/ryutaro/Developments/JavaScript/jquery.depend/src/jquery.depend.js(586): warning: anonymous function does not always return a value
    };
....^
```