Added new area for line-chart using chart.js with maximise and minimise features.
Changed CONV_DB so that it returns a copy of the conversation object to work on and not an actual conversation.
Added new tab area for time-series representation and further experiments with visualisation.
Added Rickshaw graph with visualisation of parsed conversation as time series.
Roughly encapsulated the line-chart experiment to separate from other experiments.
Introducing Rickshaw graph rendering and resizing to the time series tab.
Tidied up the way tab selection is handled with an abstraction.
Consolidated tab and page creation so that it is all now abstracted. Moving toward modular approach to features.
Corrected returning of objects from CONV_DB. Proper copy is now returned.
Tidied up first Rickshaw experiment.
Added second Rickshaw experiment which explores conversation as two trends.
Created provisional closure for metadata tab.
Merge branch 'feature-charttab'