added asciidoc support for concepts and constraints

An Ruleset-Reader for concepts declared as documentation written in asciidoc
#123 unified handling of file resources and renamed items to Resource, FileResource and DirectoryResource
#102 added tasks for available and effective rules
#102 added tests for available and effective rules
Merge pull request #137 from kontext-e/master

Bugfix: use CamelCase for PARAMETER label
#123 fixed build error
Merge remote-tracking branch 'origin/master'
#102 create a distribution module
#117 update project for GPLv3
#71 shutdown firefox after test
#117 include LICENSE file in distribution
#118 added support for additional scan dirs
apply CSS styles to report
#118 added test
#118 updated documentation
#102 updated documentation
#118 updatd documentation
#102 updated quickstart guide
#102 merged doc into distribution module
#118 fixed NPE in build