start to work on balance
Merge branch 'develop' of https://github.com/AgreeMates/AgreeMates into bills
merge from upstream
resolved merge conflicts
fix layout issues
fix a update bug caused by merging, add balance between roommates feature
add more detail info in balance table
add delete confirmation box
only creator of a bill has the option to delete it
Merge pull request #213 from samzhao88/bills

fix merging bug, add balance table, add delete confirmation and only creator can delete