initial amqp implementation
Added missing amqp-client dependency to build.gradle
change from Integer to int, enable long running connection tries with maxRetries = -1
Merge branch 'amqp' of https://github.com/h0nIg/gelfj into h0nIg-amqp

Conflicts:
	src/main/java/org/graylog2/logging/GelfHandler.java
Merge branch 'amqp' of https://github.com/h0nIg/gelfj into h0nIg-amqp

Conflicts:
	src/main/java/org/graylog2/logging/GelfHandler.java
Removed unnecessary files.