add carrierwave and avatar uploader to users
add image to form
Merge branch 'feature/add_carrierwave' into develop

* feature/add_carrierwave:
  add image to form
  add carrierwave and avatar uploader to users
Merge branch 'release/0.1.9'

* release/0.1.9:
  add image to form
  add carrierwave and avatar uploader to users