issue-34: Use Color Map with fields for Pie Chart

[nikhilj13]

Modifies Facet component to take in an optional prop fieldValueColors which can be specified in the configuration.properties.js file (in SearchUI). If a sector is selected, the pie chart will update to the color of that sector instead of using the first value in entityColors prop. Here's an example:

Users can configure the colors used for any fields that are used for creating pie charts. Here's an example configuration placed in configuration.properties.js for the above pie chart which uses the field table:

fieldValueColors: {
		table: {
			'Employees': '#007dbc',
			'Email': '#ed7a23',
			'News': '#fedd0e',
			'Research': '#db2e75',
			'Grant Proposal': '#ef8baa',
			'Dissertation': '#fcb62c',
		},
		sentiment: {
			pos: 'lightgreen',
			neg: '#ff6666',
		},
	},

[klk1010]

originating repo has been deleted. @nikhilj13 will redo PR