Adopt Guice

[GoogleCodeExporter]

I noticed that it's hard to do unit test with current setup. I think using 
Guice and easyMock will make it much easier.

But before that, we need to clean up static method.  Static makes it 
difficult/impossible to mock.

Original issue reported on code.google.com by [email protected] on 1 May 2011 at 4:10