Merge pull request #7 from inoda/style

changed app name
changed home page tagline and image
created edit group and create bill links
Added dynamic form to add members to group
added amount field and checkboxes to transaction form
Fixed JS loading bug by moving script to form partial
added transaction (billing) form
added backend validation for transaction amount format
added flash errors for transaction form
fixed placement of redirect
Merge pull request #8 from inoda/create-bill-form

Create bill form
Can edit group and add users
added STI, changed amount from decimal to string
Merge pull request #9 from inoda/show-group-members

added STI, changed amount from decimal to string
fixed view errors and spec syntax because of adding sti
Merge pull request #10 from inoda/show-group-members

fixed view errors and spec syntax because of adding sti
changed routes for payments
Added feature to add and edit groups, including JS add-members
Fixed merge conflicts
added payment form