hightstock chart impl. - first shot + add Gson library
data parsing to the highchart format is performed on the server side now
changed zoom of a stock graph
chart can render multiple data series now
new global mean series
simple rounding method of gmean series
rounding method using bigdecimal now
minor changes in graphtoolbox ui
histogram toolbox is now fully working
Merge branch 'feature-stockchart' into development