Exploring CompoundBarChartTool to fix the issue where no label showing
on a bar char with only one bar.

Adding features to scatterplottool and regressionline.
Merge branch 'master' of https://franckamayou@github.com/IVPR/Weave.git
Merge branch 'master' of https://franckamayou@github.com/IVPR/Weave.git
Working on regression tools
Merge branch 'master' of https://franckamayou@github.com/IVPR/Weave.git
Polynomial
Display polynomial line within screenBounds and draw the line smoothly
Added all regression models...
moving onto drawing the curves...
then generating the equations.
Finishin up with regression lines...
added an evalFunction that evaluates the y positions of the points used
to draw the curves.
made the code more modular
Fix bug
Set default value of currentTrendLine to Linear
Refactor the polynomial code and etc.
Merge code using screenBounds
Merge branch 'master' of https://franckamayou@github.com/IVPR/Weave.git
Finished adjusting the coefficients for the regression line equations.
Added some comments and cleaned the code of previous commit
Finished implementing the regression models. 
Improvements needed.
Fix the display style for equations
Add an option for showing or hiding the R^2 error
Merge branch 'master' of https://github.com/IVPR/Weave into fkamayou

Conflicts:
	WeaveUISpark/src/weave/visualization/plotters/RegressionLinePlotter.as
Round trip through SQL and CSV on server
Some parts hard coded(need change)

Change-Id: I206b7eb74ce46555abed89d6a6f81485c6df4f4d
Merge branch 'master' of https://github.com/IVPR/Weave into shweta
fixed natural jenks break error when only one record was added
updated documentation
fixed null pointer errors when connection didn't exist