Add AChartEngine and Jackson libraries

@josemontesdeoca @amitbharadwaj I added Jackson to make your lives easier when consuming data from Parse Cloud. I mapped `stackedBarChartDetailView` function and created a class `Dashboard` for parsing the values. You should follow it as an example. Please ping me on Slack if you have any question, we don't have much time so let's avoid banging heads against the wall!