Removed last paragraph about freezing accounts from shift reminder
email.

Jane tells me this is no longer standard practice.
Initial commit for new member_card property in the Member model.

We now have member cards, and the 12 digit UPCs that come with member
cards will be connected to their member accounts. This commit adds
the necessary "member_card" field to the Member class to make this
happen.
Updated text of member signup email per Jane's instructions.
Fix for gh-430. If a duplicate transaction is detected, the IT
coordinator is now emailed with the transaction and the IT coordinator
is notified.
Added extra text in membership signup form per Jane's request
Updated text of member signup email per Jane's instructions.
Added extra text in membership signup form per Jane's request
Merge branch 'master' of github.com:mariposacoop/mess
Small font change to a style sheet class
Added IS4C transaction ID and timestamp to transaction summary report
Second guessing of last commit. IS4C transactions in the transactions
summary report now link to their Fannie counterparts.
Slight adjustment to width's in left and right column in style sheet
IS4C Receipt link for account transactions now appears on Account page
Changed security check from is_staff to is_superuser for IS4C receipt
link in account template
Reverting  commit 771cf3459063941a04f2884369cc848020ecffbb
Disabling background image.

The background image did not fit in well with the last few commits when
MESS's width was expanded to 1130 pixels. And it wasn't very noticeable
anyway.
Close gh-431.
Close gh-432
Merge branch 'master' into revision_history
Slight tweak to CSS style sheet to make history link look better on
member page