Revert "Adds range check"

This reverts commit d1c53ec00049b3de20ea8de8e97b6b4ab61e3d61.
Explain slow loading times

Replaces junk text with a short description of possible problems users
can experience related to slow loading.
Change wording of index page

Makes the wording on the index page more friendly, so it doesn't imply
the user messed up.
Oops, these files don't need to be there.
Totally rework the base index.html to be pretty and work right.
Merge pull request #705 from magfest/text_changes

Even more text changes
Merge pull request #706 from magfest/browser_warning

Tiny cleanup
Validate the phone number box is filled out

Checks if the phone number field is empty, regardless of staffing
status.
Fix birthdate for placeholder attendees

Forces blank birthdates to None value, which the database will accept,
in order to prevent 500 errors when saving placeholder attendees.
Update model_checks.py
Remove check for SUPPORTERS_ENABLED

Since we've decoupled the kick-in levels from the supporter_level, the
options were hidden (or didn't work). This should reinstate them.
Merge pull request #736 from magfest/fix_kickin_levels

Remove check for SUPPORTERS_ENABLED
Merge pull request #732 from magfest/fix_validations

Fix validations
Fix javascript badge boxes

Fixes the Anthrocon badge boxes so the correct one will be selected,
based on the amount_extra.
Fix staffing checkbox JS error

Prevents the system from checking a currently non-existent staffing
checkbox by hiding the function call behind COLLECT_INTERESTS.
Merge pull request #738 from magfest/fix_javascript

Fix javascript errors
Merge pull request #52 from magfest/ac-staging

Sync from magfest into AC production