Added server tab
Refactored to use promises
Added POST responses saved locally on a NoSQL database
Merge branch 'develop' of https://github.com/zezutom/apimock into develop

# By zezutom
# Via zezutom
* 'develop' of https://github.com/zezutom/apimock:
  GET requests map to a nested set of directories, where the last value ends up as a file. Corrected an erro in js/raw-parser/index.js: 'error' was undefined. I tried replacing with new Error(400, 'empty body'), but I started to get HTTP 400 on everything, so I removed it completely.