Add Behance Importer

Hello,

— I'm really new to Ruby so, thank in advance for your indulgence —

I've built a little importer draft that works with [Behance's API](http://www.behance.net/dev). It imports all projects from a specific user and create new post entries for each project. For now, it's pretty straightforward : all the meta datas returned by the API are stored in the post variable named "project", all of them, as delivered.

So, before going any further, I'd like to have some feedback from you guys.

I'm pretty sure it could be better if the project modules are printed in the post content (instead of relying on the metadatas) and if images are stored locally.

Do this project follow the jekyll-import guidelines? Should I publish it as a standalone import script? And what about new branches for new importers, I haven't seen one. And finally, do you think an importer go against the API [terms of use](http://www.behance.net/dev/api/terms)?

Any help and feedback is welcome.

Thanks.