created pie chart for nativity with selector for both year and ward.
created ages data in R. Exported to ages.csv. Merged data into a bar chart piechart_age.html.
changed variable names in attempt1 (map) so they wouldn't be confused with other charts.  Added js to seperate file called visualization.js which is linked to index.html. Centered map in row.
changed div id names from vis to mapvis.
added age barchart to main vis.js file. Changes height/width variable names, height/width values, and div id name.
added nativity chart into index/visualization.js. Adjusted sizing, variable names, etc.
Added d3.legend.js. Genderated legends on pie charts. Revised names in nativity.csv. Fixed Color Scales.
Fixed whatever had broken by pulling in git 554bee7057