Added some helper functions
Added test schema and configuration for test db

Added sample user json
Implemented add user endpoint

Added method for creating a test database
Simple test for add user endpoint
Configure tests for travis
Don't add password option if password is empty
Validate lenght of user's first name
Implemented endpoint for retrieving user's devices
Implemented add device endpoint
Ignore files in libs directory
Initial client side project structure
Added instructions for running client side
Say where the client code is residing in README
Don't add json content type to every response

Add it only for the json api
Remove handler for index.html
Fixed path of arp table file
Initial implementation of add device form
Set device user id before inserting into db
Call server api for registrating device if data is valid

Display errors when something goes wrong
Implemented endpoint for updating user
Forgot to commit test data for update user