5.1.0

1. New 'float' browser kind overlays with objects drawing
2. Browser can be enabled after drawing with 'nobrowser' mode
3. One can hide browser or switch browser kind at any time
4. New 'horizontal' and 'vertical' layouts for object display.
   One could configure several frames, each divided on sub-frames.
   Like display=horiz231 will create three horizontal frames,
   divided on 2,3 and 1 sub-frames.
5. Optional status line where current tooltip info will be shown
6. Improve enlarge functionality - now works with all layouts
7. Do not display all canvas tool buttons by default - provide toggle button instead
8. Let move TAxis title, its position now similar to ROOT graphics
9. Support 'col0' option for TH2Poly class to suppress empty bins
10. Implement for TH3 'box2', 'box3', 'glbox2', 'glcol' draw options
11. Support more superscript/subscript letters in normal text output
12. Correctly handle unzoom with logx/logy scales
13. Let disable stamp parameter in file url with "-" sign at the end of file name
14. Let use quotes in the URL parameters to protect complex arguments with special symbols
15. Introduce direct streamers - like TBasket or TRef
    Benefit - one can add custom streamers of such kind or reuse existing
16. Handle TMatrixTSym classes in I/O
17. Correctly count TH3 statistic in TTree::Draw
18. Recognize bower installation when "bower_components/jsroot/scripts" string
    appears in the script path (#120)