Updating documentation for LogstashTcpSocketAppender: including example configurations for logback.xml and logstash config file.  Hope to resolve issue #47.
Shorten logger name field length like you can doing %logger{36}. Added test and documentation for it too.
Merge pull request #51 from kyleprager/master

Added LogstashTcpSocketAppender configuration example to README.md.  Added ability to limit length of logger name field and docs for it to README.md.