Merge pull request #22 from Batigoal/master

Enabled programmatic attachment of custom GelfSenderProvider
Support for coveralls.io
Merge remote-tracking branch 'origin/master'
Support for coveralls.io
#23 json-simple 1.1.1, log4j2 2.0, commons-pool2 2.2
#23log4j2 2.0
Allow submission of the full MDC (includeFullMdc) #24
Added testing with redis and the TCP sender
Added testing with redis and the TCP sender
SVN build image from travis
Fixed tests
Removed large tcp test
Fixed cobertura report
Added tests
Added tests
Support older versions of git, removed --single-branch
Added tests
Added tests
Added tests
Test fixes