Store gradient/color information in DB [ Fixes #307 ]

[cjchirag7]

Fixes #307
To store the colors , provenance.analysis.setting will have a new field 'colors'

• When mode is 'binal', length of colors is 1
• When mode is 'gradient', length of colors is >=2

The query which was earlier something like -

{"provenance.analysis.fields":[{"name":"necrosis","range":[0,1],"value":[0,1]},{"name":"tumor","range":[0,10],"value":[0,10]}],"provenance.analysis.setting":{"mode":"gradient","field":"necrosis"}}

is modified to -

{"provenance.analysis.fields":[{"name":"necrosis","range":[0,1],"value":[0,1]},{"name":"tumor","range":[0,10],"value":[0,10]}],"provenance.analysis.setting":{"mode":"gradient","field":"necrosis",colors":["#F23112","#553172","#333117" ] }}

In case, when mode is 'binal', the value of color[0] is the selected color .

[cjchirag7]

A Screencast of the working

[birm]

Awesome; thanks!