plot = { name: <name>, type: "histogram" or "point", data: { label1: (N, 3) array, label2: (N, 3) array, …}, axes: { xlabel = …, xunit = …, ylabel = …, yunit = …, …} }

System test failed: have to remove the assigment of "framework" category
Documentation test failed: now create the workspace on the fly

forgot to commit changes to the source code at the last commit for this

Added an altorightm to serialize 1D workspace data
into a json dictionary and save.
Added files into Framework/PythonInterface

 * plugins/algorithms/Save1DPlottableAsJson.py
 * test/python/plugins/algorithms/Save1DPlottableAsJsonTest.py

Tests include 3 cases:

 * single curve (point data)
 * single histogram
 * two curves

TODO:

 * Add validation into tests
 * Support optional property to assign a name to the plottable(s)
 * documentation