Tweak homepage pitch

Trying to make it more direct and comprehensive, a little less bullshitty?

![screen shot 2014-07-31 at 11 13 00 pm](https://cloud.githubusercontent.com/assets/134455/3774430/d2cdb10c-192a-11e4-9500-a3d3f54ab7bc.png)

Old:

![screen shot 2014-07-31 at 11 21 04 pm](https://cloud.githubusercontent.com/assets/134455/3774433/e8342576-192a-11e4-96fa-d6030c9e7389.png)