Merge pull request #47 from CodePath-MAF/dashboard-merge-master

Dashboard merge master
Get the transaction view working
Add the category stacked bar chart
Add methods to calculate how much has been saved and spent within various date ranges
Configure the signup view to use the email as the username
debits are negative, credits are positive :(
Store totalCash on the user model
added assets to project
removed app icon, not the right size
set auto layout for goal card, cleaned up of views