adds "closing test" to restore process.env.REDISCLOUD_URL in failure …

…simulation test dwyl#38

Adds Error Event Handler to report connection fail. no other code cha…

…nged so easy/optional update! see: dwyl#38

fixes issue with end() >> end(true) described in issue: dwyl#29 no co…

…de change required in downstream, recommend using redisClient.end(true)

No Code Changed. Just adds CONTRIBUTING.md file for contribution clar…

…ity see: https://github.com/dwyl/contributing

fixes node_redis warning described in dwyl#31 100% backward compatible

streamlined & updated to latest version of redis.

minor re-factor. adds kill() & killall() methods. tested & documented…

…. 100% backward compatible

single connection

update to latest node.js removes support for hiredis as it requres la…

…test GCC (compiler)

update dependencies to latest. no code changes. non-mandatory update