ed_classified 7.x-3.1-beta1

This is only a bug fix and documentation release. No functional change over 7.x-3.0. It is expected to become the final 7.x-3.1 unless additional bugs are discovered.

• Minor formatting cleanups.
• Updated README for 7.x-3.x branch.
• #1733594: Grace delay for expired ads set to -1 not working by fgm: infinite grace was not honored.
• #1653560: Character limit not working if user uses 'cut & paste' or disables JS by fgm: Added server-side validation for body length.
• #1553010: dsm() function in classified_notifications.module by fgm: removed dsm() in classified_notifications_deliver().
• #1511962: Add config link in info file by fgm, rogical: Added configure link to info files.

All code changes were developed in TDD mode using Simpletest functional tests.