Merge pull request #13 from strima/master

* added possibility to send to redis (via jedis client)
#14 Change log framework dependencies from compile to provided
Merge branch 'master' of https://github.com/mp911de/logstash-gelf
Prepared release 1.4.0
Prepared release 1.4.0
Prepared release 1.4.0
Prepared release 1.4.0
[maven-release-plugin] prepare release logstash-gelf-1.4.0
[maven-release-plugin] prepare for next development iteration
Refactored GelfSenderFactory for use of common GelfSender implementation
outside the core project (including tests)

Refactored/Fixed GelfREDISSender for use in multihreaded environment
Removed unused method
Added possibility to configure connection-string without port (and take
port from configuration)
Logback appender should use formatted message

Logback appender should use the formatted message instead of the plain one.
Merge pull request #15 from felixhamel/patch-1

Logback appender should use formatted message
Adjusted snap-ci build image
Updated Readme, fix #16
Added extended redis handling:
	- Multiple redis hosts possbile
	- Different distribution strategies
	
Added possibility to log unsent message to alternative logger
Fixed bug on jedis pool caching
Merge pull request #17 from Batigoal/master

Redis bugfix and GelfSender flexibility
Prepared release 1.4.1