Refactor travis-ci so it only build coverage from openjdk8

Bump version to 2.2.4

Remove debug logs

Publishing 2.2.2 jar file

Added support for application/json content-type

AutoVerify rebranded to AppVerify, refactored associated names.

Fixed date localization issue for rfc2616 http date header, it will n…

…ow be fixed to Locale.US.

Added codecov badge to README.

Added constructor overloads for all clients.

Merge pull request TeleSign#55 from Manmohan-TechM/July_2015

July 2015