update version number
start v1.6 dev
Merge branch 'master' of github.com:NickQiZhu/dc.js

Conflicts:
	src/core.js
fix #267
fix #259
fix #248
Allow zoom-out to exceed the original domain

.. and allow the caller to control the zoom scale and turn on/off the zoom-out restriction

Reference #176
[#252] add test for symbol placement
Merge remote-tracking branch 'origin/master'

Conflicts:
	dc.min.js
Generate gh-pages branch from master.

Fixes #274
move playground to web
split out stock js from html
update jsdom
remove weird VA artifacts