Updating docs build file to zip up docs.
Updating docs build file to zip up docs.

Zip docs will be named easeljs_docs.zip, and placed in the output directory.

8823-scholar/EaselJS,exsodus3249/EaselJS,felipegtx/EaselJS,SpringRoll/EaselJS,rhildred/abacus,julianromera/EaselJS,gitzxon/EaselJS,markknol/EaselTS,ebabel-eu/EaselJS,speedlightconsulting/EaselJS,ovcharik/EaselJS,legendvijay/EaselJS,mientjan/EaselTS,speedlightconsulting/EaselJS,kidaa/EaselJS,felipegtx/EaselJS,abouthiroppy/EaselJS,createjs-components/easeljs,EricHodgins/EaselJS,thinkerchan/EaselJS,kidaa/EaselJS,Teino1978-Corp/https-github.com-Teino1978-Corp-EaselJS,zhengjiangbin/EaselJS,briesurrood/EaselJS,bambalaus/EaselJS,SpringRoll/EaselJS,mientjan/weasel,xushuwei202/EaselJS,gitzxon/EaselJS,EricHodgins/EaselJS,andrew168/EaselJS,mientjan/weasel,8823-scholar/EaselJS,xushuwei202/EaselJS,nbellowe/EaselJS,exsodus3249/EaselJS,abouthiroppy/EaselJS,mientjan/EaselTS,markknol/EaselTS,julianromera/EaselJS,legendvijay/EaselJS,CreateJS/EaselJS,zhengjiangbin/EaselJS,CreateJS/EaselJS,ebabel-eu/EaselJS,andrew168/EaselJS,Teino1978-Corp/https-github.com-Teino1978-Corp-EaselJS,ytiurin/EaselJS,thinkerchan/EaselJS,johnv315/EaselJS,briesurrood/EaselJS,nbellowe/EaselJS,ovcharik/EaselJS,markknol/EaselTS,rhildred/abacus,ytiurin/EaselJS,bambalaus/EaselJS,johnv315/EaselJS