Exam admin controller

Added form for global settings. Changed some css to make it work. Added
ExamGlobal entity.
Start exam with global settings
Exam and Review with exam/grade distinction.
Wait until grading starts

Added a check to make sure you can't get to the waiting screen until
grading starts. Updated the start page to show all information.
Section Support, Better test finding, better waiting.
Timer bug

Fixed bug where timer would count down from when you started the test
when it was supposed to count down from when you started grading.
Date Checkage

Checks to make sure the exam/grading date/start/end's are all good.
Initial download working
No more twig

Stopped trying to use twig for downloading because I couldn't leave any
whitespace, making it unreadable. Switched to echoing from the
controller. Giving me a lot more power to do calculations and minimize
errors.
Better downloading,

Should be able to handle people not finishing, people dropping the
class. Also got stopped storing unencrypted student ids anywhere.
Downloading overhaul
Grade Entity

Added an entity to represent a graders grade for an answer.
Bug fixes, bio:setup

Added code to initialize the examglobal entity in the database.

Fixed bugs:
1. The loops that found the total mean score would overwrite variables,
causing the points to be displayed incorrectly.
2. If the exam didn't exist it would try to continue anyways
3. If you had been assigned a grader who didn't grade, it would try to
add the null scores anyways.
4.The average loop didn't even compute the average…
Merge branch 'download-exam' into global-settings
Evaluation Setup

Created a response and query entity for making and recording evaluation
questions/answers. Setup the manage evaluation page so you can create
and remove questions.
Save Queries

You can now create and edit queries. Deleting does not work.
Global Settings setup

Global settings now render to the manage exams page.
Some global settings

Added support for multiple field trips. Also made signing in impossible
until the opening date.
Store Default Queries globally
Add multiple choice

Added the javascript/html/css to add multiple choices questions with a
number range.