Port people search to Bootstrap

This was part of #4657 which might take a while. 

I moved the files for blueprint invitations and added new ones for Bootstrap invitations. Once the stream has been ported to Bootstrap one could remove the old blueprint invitation files.

![people search](https://cloud.githubusercontent.com/assets/3798614/3635020/510e1746-0f58-11e4-90fa-8bc44555659c.png)

![invitation](https://cloud.githubusercontent.com/assets/3798614/3635022/6e0c969c-0f58-11e4-90dd-bfefd7169cd6.png)
Thank you for your suggestion. I just implemented the second option.