Add Travis badge

Add from_hex and to_hex

Update readme

Finish implementation of symmetric encryption

Implement crypto_secretbox_keygen()

Test randombytes_buf

Remove jest in favor of karma/mocha/headless Chrome

Add missing tslint.json file

Add tslint config

Add Travis file

Add test infrastructure

First implementation of crypto_secretbox_easy and crypto_secretbox_easy_open

Add config files

Add package.json

Initial commit