Add CodeMontage Code of Conduct

![image](https://f.cloud.github.com/assets/2766324/1865021/c2a074c8-7802-11e3-9d5a-dcd9e083b584.png)

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![image](https://f.cloud.github.com/assets/2766324/1865039/7e5b361c-7803-11e3-801f-237e7dad4113.png)


*Potential improvements:* It could use a some design help.