#2 adding bower dependency to angular nv-ded3 directives
#2 implemented a directive for choosing the x / y axis of the relation analyis graph
#2 implementation of the relation analysis chart directive
#2 fixed jslint warnings
#2 setting x axis tick format to avoid error when showing tooltip of data item
#2 introducing height property to allow  the definition of the chart height
#2 refreshing the chart when the forCriteria property has changed
#2 minor formatting changes
#2 showing an error message when no worldstates are selected
#2 karma tests for the relation analysis chart
Merge branch 'feature/2-relation-analysis-graph' into dev