Set a default Feature to use in the CrawljaxConfiguration
Save the near duplicate detection distance to the json

Conflicts:
	core/src/main/java/com/crawljax/core/state/StateVertexNDD.java
	plugins/crawloverview-plugin/src/main/java/com/crawljax/plugins/crawloverview/model/State.java
Add slider and dummy feedback to the overview
Initial simple working algorithm for the threshold-slider.

Remove duplicate-states in the crawl-overview for the threshold given
by the slider.
Save onNewState the distance to all other states in sfg

Conflicts:
	plugins/crawloverview-plugin/src/main/java/com/crawljax/plugins/crawloverview/model/State.java
Save a list of states in which order the where inserted in the sfg
Implement the callback of the threshold-slider
Implemented new thresholdslider-function, which uses the distance-table from the json-file

features:
- Deletes fragemented graphs
- Doesn't need presorted arrays
Additionally this commit:
+ Use the state-name as reference in the json
+ Removed the hashes and minDuplicateDistance from the json

Conflicts:
	core/src/main/java/com/crawljax/core/state/StateVertexNDD.java
	core/src/main/java/com/crawljax/core/state/duplicatedetection/DuplicateDetectionModule.java
	plugins/crawloverview-plugin/src/main/java/com/crawljax/plugins/crawloverview/model/State.java