Change BOMs to *not* inherit from maven-parent
Prepare next development iteration
Simplify structure, remove maven-parent POM
Configure JaCoCo to merge coverage for unit and integration tests on Travis

This is needed for Coveralls.
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
Update readme
Rename gpg.sign.skip to default gpg.skip
Release version 2.1.0