Merge pull request #3 from Jalle19/fix-php71-compat

Run Travis CI tests on Trusty instead of Precise, should fix the hhvm build

Run Travis CI tests on PHP 7.0 and 7.1 too

Replace ircmaxell/random-lib with paragonie/sodium_compat

Add some files to .gitignore

Add ApiGen via Composer

Update README.md

Update README.md

Update README.md

Update composer.json to require PHP 5.4 and remove PHP 5.3 from Travis build

Update composer.lock

Update README.md

Refactor the ShortId class to a non-singleton

Add project files

Initial commit