remove spot instances for the MVP demo
Merge branch 'cost-feature' of https://github.com/Fathalian/nestor into cost-feature

# By Farzad
# Via Farzad
* 'cost-feature' of https://github.com/Fathalian/nestor:
  removing extra properties from EC2 modifying the sample solution so the instances are m3.medium small jshint fixes and other stuff