Switch from link to button

Previously the "add photo" button was a link styled as a button - so
button enabler would add a 'href' attribute. Changing it to a button
seems to alleviate the issue.

Fixes #711
Gate off add photo using new button enabler

Fixes #716.
Check linkData keys to avoid KeyError

fixes #693 on github.
Merge pull request #720 from steventlamb/bug/693/tree_key_error_page

Check linkData keys to avoid KeyError
Merge pull request #728 from RickMohr/update-activation-complete-text

Update "activation complete" text per Deb and style per Mike
Fix text legibility issue
Style the password reset process

To get the custom template to properly override the stock templates I
needed to make sure our app is installed before Django registration.
Adam changed the app load order in 69f709eb, but I talked to him and
said it was most likely ok (and more correct) to switch it back.

Fixes #710
Remove default activation templates

These are overridden in the management application so these stale,
unstyled overrides were only causing confusion.
Update 404 page text and link
Merge pull request #717 from ahinz/fix/photo-issues

Fix/photo issues
Merge pull request #731 from mtedeschi/topic/prelaunch-styling-fixes

404 Page Update and Text Legibility
Drop get_field_by_name to fix app in gunicorn

fixes a pre-deployment bug found where the app was working for unknown reasons during tests and with the django runserver but was breaking when run with gunicorn. The problem, in a nutshell, is that get_field_by_name does a full import process that chokes, for unknown reasons, on a downstream app. This whole problem is circumvented by not using get_field_by_name. see comment block for more details.
Merge pull request #733 from steventlamb/bug/fix_gunicorn_builds

Drop get_field_by_name to fix app in gunicorn
Merge pull request #730 from jwalgran/topic/style-password-reset

Style password reset
Remove data-action attribute in buttonEnabler

fixes #701 on github.

The 'Add Tree' anchor tags use a 'data-action' tag to enable the add tree mode. The button enabler removes this action in the case of disabling or redirecting, in order to prevent this behavior from leaking through.
Merge pull request #737 from steventlamb/bug/701/add_tree_not_redirecting

Remove data-action attribute in buttonEnabler
Revert change to activation_complete.html