Add Software Product Subscription Agreement to select plan form

![screen shot 2014-02-16 at 11 01 24 pm](https://f.cloud.github.com/assets/716573/2182577/b2fb88f2-9790-11e3-8428-999f833904e3.png)
![screen shot 2014-02-16 at 11 01 32 pm](https://f.cloud.github.com/assets/716573/2182579/b865c92e-9790-11e3-8d3a-1749b9042b59.png)