Prepare next development iteration
Set project.reporting.outputEncoding and remove unecessary <encoding>
Replace java.{source,target}.version with single java.version property
Configure JaCoCo to merge coverage for unit and integration tests

This is needed for Coveralls.
Update maven-checkstyle-plugin to 2.12.1
Define all plugins versions in pluginManagement
Update JaCoCo configuration to use new prepare-agent-integration goal
Simplify failsafe configuration

argLine: -Dfile.encoding=UTF-8 is not necessary anymore.
Update slf4j to 1.7.7
Add source for src/it/groovy and src/it/resources
Release version 1.1.5