Add  accept_hostkey=true to git clone actions

Fix error:

msg: github.com has an unknown hostkey. Set accept_hostkey to True or manually add the hostkey prior to running the git module

![screen shot 2014-09-30 at 02 32 22](https://cloud.githubusercontent.com/assets/510788/4450696/993f2510-4828-11e4-8c4c-c424dd2d66a5.png)