Merge pull request #22 from dictyBase/master

Merging master to develop to keep developing
Updating changes in the structure of the HF
Adding the grid to the frontpage

The main grid system of the frontage is now defined. It follows the
original draft for the frontpage. Documentation will be provided
explaining the details of the responsive behavior.
Renaming and refining some of the files

Some images for documentation purposes are added.
Replacing TIFF by JPG

Due to requirements by github, images to be included in the MD files
cannot be tiff.
Updating doc about the front page grid system
Initial git subtree command
removed dist to root folder