Format person a little better if email is not set
Added breadcrumbs to the views
requirements.txt: Store our requirements in a pip-installable file

https://pip.pypa.io/en/latest/user_guide.html#requirements-files
README.md: Mention 'make database' to use the redacted data
New site field: notes
Notes for events!
Defining constant `ITEMS_PER_PAGE` for pagination.

Instead of separate constants for paginating different views, use
one constant in `views.py` for pagination size.
Merge pull request #65 from wking/requirements

requirements.txt: Store our requirements in a pip-installable file
Merge pull request #69 from wking/flexible-db-initialization

README.md: Mention 'make database' to use the redacted data
Merge pull request #71 from gvwilson/defining-constant-for-pagination

Defining constant `ITEMS_PER_PAGE` for pagination.
Merge branch 'notes' of github.com:pbanaszkiewicz/amy into notes
Updating migration script and database dump to reflect schema changes.

1.  Modified `migrater.py` to insert empty string for `notes` in `site` and `event`.
2.  Created new `db.sql` dump containing these changes.
Merge branch 'notes' of github.com:pbanaszkiewicz/amy into formatting-notes
Formatting display of notes.

Since notes for events and sites are likely to be large, this puts them in a `pre` block outside the table display.
Breadcrumbs linking to objects when editing them

I added breadcrumbs in `*_form.html` templates to link to details of
the object being modified.
Merge branch 'master' of github.com:swcarpentry/amy into notes
Merge pull request #1 from gvwilson/formatting-notes

Formatting notes
Merge pull request #2 from gvwilson/notes

Updating migration script and database dump to reflect schema changes.
Changed 'notes' columns: un-NULL'd, w/ default value

Model fields 'notes' (for Site, Event models) could be NULL, but, as
@rbeagrie
[pointed out](https://github.com/swcarpentry/amy/pull/60#issuecomment-66985725),
they may not work correctly after object has been edited.
Merge pull request #60 from pbanaszkiewicz/notes

Notes