#157 #212 Check number of settings in ConfigurationRequirement and throw an exception instead of returning boolean.
#157 #212 Update comments.
Merge branch 'master' into ConfigurationRequirement
Merge branch 'master' into ConfigurationRequirement

Conflicts:
	backend/src/main/java/de/metanome/backend/configuration/ConfigurationValueFileInputGenerator.java
Merge branch 'master' into ConfigurationRequirement
Update docs in ConfigurationRequirement.
Merge branch 'master' into ConfigurationRequirement
Merge branch 'master' into ConfigurationRequirement
Move check of number of settings to super class.
Merge branch 'master' into ConfigurationRequirement
Merge branch 'master' into ConfigurationRequirement
Merge pull request #237 from HPI-Information-Systems/ConfigurationRequirement

Configuration requirement
Merge remote-tracking branch 'upstream/master'