+ generify little bit MetricGroupNode
+ extract AbstractTree from ControlTree with "cascade check - one event" functionality
+ create LegendTree with specific cell (LegendNodeCell)
+ set labels for series to see them on *.png
+ legend represents as tree on top of plot
Merge branch 'legends-client-final' of github.com:amikryukov/jagger into legends-client-final

Conflicts:
	webclient/src/main/java/com/griddynamics/jagger/webclient/client/components/ControlTree.java
	webclient/src/main/java/com/griddynamics/jagger/webclient/client/components/PlotContainer.java
	webclient/src/main/java/com/griddynamics/jagger/webclient/client/components/PlotRepresentation.java
	webclient/src/main/java/com/griddynamics/jagger/webclient/client/components/PlotsPanel.java
	webclient/src/main/java/com/griddynamics/jagger/webclient/client/components/PlotsPanel.ui.xml
	webclient/src/main/java/com/griddynamics/jagger/webclient/client/resources/JaggerResources.java
	webclient/src/main/java/com/griddynamics/jagger/webclient/client/resources/JaggerWebClient.css
	webclient/src/main/java/com/griddynamics/jagger/webclient/client/trends/Trends.java
	webclient/src/main/java/com/griddynamics/jagger/webclient/client/trends/Trends.ui.xml
+ fix trends . todo JFG-803
+  minor changes
merge with branch of 529 pull request
+ default font-size == 13px
+ fixed size of show/hide legend label
Merge branch 'master' of github.com:griddynamics/jagger into legends-client-final
+ minor changes
  - noRedrawingPlot() - why?
  - remove Series in for loop
  - use constants for calculating legend width
+ use one mechanism to populate controlTree and legendTree
Merge branch 'master' of github.com:griddynamics/jagger into legends-client-final

Conflicts:
	webclient/src/main/java/com/griddynamics/jagger/webclient/client/components/DynamicLayoutPanel.java
	webclient/src/main/java/com/griddynamics/jagger/webclient/client/components/PlotsPanel.java
Merge pull request #544 from amikryukov/legends-client-final

JFG-784 Display legend as tree and add possibility to collapse it