Only the Footer Angular Directive

The footer has been reduced to just a directive, deleting the previous
independent component of an angular application (controller, service,
etc)
Upload header and footer images grid design
Update the images of header and footer
Description of bootstrap grid design for H and F
Adding directive and controller of the HEADER
Unifying controllers in the no unifying version

The controller is going to basically access the same http resource, so…
why having two if they are going to do exactly the same thing?
Merge pull request #4 from dictyBase/feature/includeEverythingInDirective

Merging the footerDirective test in develop