Refactor chunks of init_db into a script lib.
Name tweaks, return OK on delete without checking for # of rows.
Grid/data entry improvements.

* Added a delete button/made deleting work.
* Set up validation for new line items.
* Added Updated column with continually-refreshing moment.js text.
* Some css tweaks.
* added the backgrid moment cell extension.
* Sorted out date handling -- model always holds a unix timestamp.
* Rename work expenses to work_expenses internally.
work expenses -> work_expenses
Remove placeholder text