commit to dev branch
added color lib for d3.js
added co-occurence matrix visualisation
improved rendering of graphs and matrix
- added WordCloud view
- improved usability of keyword category (filter, overflow)
- fixed a few bugs
- added basis for user-defined keywords
- fixed UI issues with keyword manipulation
- updates JQueryUI
added d3.js cloud plugin [missing from previous commit]
improved rendering of adjacency matrix
changed rendering of structure tags in mashup
updated bootstrap
fixed rendering of JSON example [to redo in a better way]
fixed bugs in rendering adjacency matrix
improved popover for matrix
- improved rendering of matrix
- added ajax-supported handlers for essay data
- added chord graph for sentences
added a very basic example of a JQuery Tour [to test again]
- added cytoscape.js to assets
- added first basic rendering of sentences/keywords graph 
  [need proper controller]
- improved cytoscape display
- fixed bugs in orchestrator [to be redone]
- updated JQuery Tour
- various improvement of UI and templates
improved dispersion graph [computation to be reviewed]
 - added JQuery Isotope to assets
 - improved dispersion graph
 - redesigned sentence view (sort, layout, colors)
 [to be continued]