added /etc/default/elasticsearch (fixes spujadas#97)

updated tag naming scheme

upgraded stack to version 5.0.1

install Elasticsearch manually instead of using APT repository (fixes s…

…pujadas#85)

quit if ES fails to start, and get cluster name using ES API (replaces …

…spujadas#76)

Merge branch 'cjnygard-update-versions'

upgraded Elasticsearch to version 2.3.5, and Kibana to version 4.5.4

upgraded Kibana to version 4.5.3

Merge branch 'master' of github.com:spujadas/elk-docker

upgraded Elasticsearch to 2.3.3 and Kibana to 4.5.1