Add date fields for expiration range search

What it does:
1) Enables entry of date range for expiration/renewal dates (paid_thru)
2) Does not effect keystroke search of text
3) Executes date range search on click of button (includes text search if present)

Needs help:
1) UX needs work, and date text fields should be date pickers
2) Ranges should be included in export (and be able to stand alone in export when there is no text search)
3) General love