started InputParameter refactoring
Merge remote-tracking branch 'origin/master' into dev_jakob

Conflicts:
	frontend/src/main/java/de/uni_potsdam/hpi/metanome/frontend/client/parameter/InputParameterWidget.java
attempting merge
add gitignores to enable merging
manual merge
create ConfigurationSetting for Strings
refactor InputParameter
Merge remote-tracking branch 'origin/dev_jakob' into dev_claudia

Conflicts:
	frontend/src/main/java/de/uni_potsdam/hpi/metanome/frontend/client/parameter/InputParameterBooleanWidget.java
	frontend/src/main/java/de/uni_potsdam/hpi/metanome/frontend/client/parameter/InputParameterDataSourceWidget.java
	frontend/src/main/java/de/uni_potsdam/hpi/metanome/frontend/client/parameter/InputParameterWidget.java
refactoring progress