#11 Add balance calculation
Revert "#11 Add balance calculation"

This reverts commit 7579ec890d796d0ea365be4f4c5c1c1365a11728.
#11 Add balance calculation
Change amount to decimal
Merge branch 'master' into features/11

Conflicts:
	db/schema.rb
Rebuild balance for project. Create balance for user.
Revert "Rebuild balance for project. Create balance for user."

This reverts commit 6064130f7999e2b7b88c63ae675042e948c9cf67.