Converting tab characters to spaces

Currently all the ruby files have odd tabbing in the files that makes them hard to read when browsed on Github.  I've converted all the tabs to spaces so the code is a bit easier to read.

All tests still pass when ran.

### Before
![Before](http://cl.ly/image/3K1l0X1f0W0l/Screen%20Shot%202013-04-09%20at%2011.51.56%20AM.png)

### After
![After](http://cl.ly/image/0M3w1U151D0L/Screen%20Shot%202013-04-09%20at%2011.51.38%20AM.png)