Change the Sample Tuna Catch Application to use POST requests

[abelsilva]

Using the previous GET requests, the addTuna failed when GPS coordinates had negative values because

e.g.: 64.586734, -1.521949

[abelsilva]

also, the server.js was calling

var app = express();

two times, I removed the second call

[tkuhrt]

@abelsilva : .editorconfig would be specific to your environmet and not needed to be committed to the repository. Also, you will need to sign off your commit before we could consider merging this. Please see the -s option on git commit

[abelsilva]

@tkuhrt all done