Moved add button to between blocks.

Still need to style and make it work for node-webkit.
Started styling.
More styling.
Create block at the correct place for node-webkit.
Fix `addBlock` action in tests.
Merge branch 'master' of github.com:slamdata/slamdata into issue-14

Conflicts:
	bin/node-webkit/js/slamdata-node-webkit.js
	bin/node-webkit/js/slamdata.js
	src/SlamData/App/Workspace/Notebook.purs
	src/SlamData/App/Workspace/Notebook/Block.purs
Change back slamdata dep for node-webkit so travis does not barf.
Merge pull request #86 from joneshf/issue-14

Issue 14