LB-1394 grunt config sample

Added config.sample.json.
Added update-config task for grunt.
Grunt default also loads update-config and install-hook now.
Merge pull request #36 from patriciagarcia/LB-1382

LB-1382 Add blog and posts polling functionality
LB-1394 Added file check for install-hook.
Merge pull request #39 from patriciagarcia/LB-1382

LB-1382 Fix missing stop method
Merge pull request #38 from nistormihai/LB-1394

LB-1394 grunt config sample