reorganized JS and CSS files into files and folders
added D3 into the project
added test files for working with D3--tehse are temporary
Merge branch 'master' of https://github.com/theInternauts/post-it-notes
adding a Model for post-it groups. The model will only track the ID's of the posts in each group
added 'group_create' function to create and add a post-it group to the board
REFACTOR: change the declaration style of a few private functions to be consistent inside the class
added function 'group_count'
added function 'group_list' to return the object conatining the groups on this board
added function 'group_id_list' display the IDs of all of the groups on this board
putting the post-it group DOM element on the board
implemented a group deletion method.  Changed 'remove_reflow()' to allow for use across any given array (groups[] or list[] in this case)
added a toolbar to the board
added event listener to the 'create group' button in the toolbar
groups have been made a droppable zone.  Next step: The height needs to expand when notes are appended
dropping a post-it into the group's dropzone updates the DOM and the model. This also expands the height of the group
BUGFIX: each appended post-it was being added to the wrong DOM node.
Merge pull request #1 from theInternauts/post-groups

Post groups