BADCamp work

Hi!

I fixed a lot of thing related to changed APIs and continued the porting a bit but I have finally been asked to work on some core issues.
At this moment, 
- ParagraphsType creation and fielding is OK
- ParagraphsItem creation is OK but decoupled from an host entity
- ParagraphsItem are listed in an overview page accessible with a custom permission
- ParagraphsItem display do not include Fields value (I don't know why)

I made a lot of small commit to ease the reviewing process and I tried to keep the commit messages as clear and simple as possible.
Feel free to ask me if something looks strange for you.