[tddium] Support internally hosted TDDium projects

Support TDDium Enterprise, a privately deployable version of TDDium (https://www.solanolabs.com/#pricing) 

![Example of input field](https://cloud.githubusercontent.com/assets/1108361/3787726/1347cbc6-1a31-11e4-9940-ff6195f7ffb6.png)