[maven-release-plugin] prepare release wro4j-parent-1.7.1
release wro4j-runner-1.7.1
Merge branch 'runnerUpdate' into 1.7.x
start new development iteration
do not change classLoader in provider finder to make it work when using maven plugin
avoid adding duplicate providers & add more unit tests
Merge branch 'issue786' into 1.7.x