The home page

[kelvinst]

• A button Add new bill that goes to Dashboard#new
• A fixed header with:
  • The total amount you owe to people, it must consider the bill items you are member
  • The total amount people owe you, it must consider the bill items you are payer
  • Your current balance
• The list of bills, separated by the titles I owe them and They owe me
• When you click on the total amount you owe them, go to I owe them
• When you click on the total amount them owe you, go to They owe me
• All my bills

[kelvinst]

Depends on #5.