Added highcharts converted for record set JSON object.
Merge https://github.com/qminer/qminer

Conflicts:
	src/qminer/js/visualization.js
Merge pull request #29 from cfortuna/master

Added highcharts converted for record set JSON object.
Merge branch 'master' of github.com:qminer/qminer
renamed a converter that takes an array of multiple time series measurements to highchartsTSConverter