Refactored entities.

Refactored classes in `AbaLookup\Entity` namespace. The location specific classes
are likely no longer needed as we are going to be using a 3rd-party maps/distance
API. Added a UserType enumeration (kinda?) class that holds the types a user can be.
Refactored unit tests to reflect updates to classes.

Also,

- Removed traces of moderator flag until we figure out what that is/will be. (MUNComputerScienceSociety#52)
- Renamed sex to gender. (MUNComputerScienceSociety#63)
- Certificate of Conduct now stored as the date recieved, NULL indicating that it was not recieved. (MUNComputerScienceSociety#93)
- UserType class uses reflection (which is probably a bad idea).

module/AbaLookup/src/AbaLookup/Entity/Pairing.php

@@ -43,6 +43,8 @@ class Pairing
 	protected $score;
 
 	/**
+	 * Whether this pairing should be excluded from results
+	 *
 	 * @Column(type = "boolean")
 	 */
 	protected $excluded;
@@ -52,7 +54,7 @@ class Pairing
 	 *
 	 * @param User $a The 1st user in this pairing.
 	 * @param User $a The 2nd user in this pairing.
-	 * @param float $score The score.
+	 * @param float $score The score for this pairing.
 	 * @throws InvalidArgumentException
 	 */
 	public function __construct(User $a, User $b, $score)
@@ -87,9 +89,9 @@ public function setScore($score)
 	}
 
 	/**
-	 * Sets this pairing to be excluded
+	 * Sets whether this pairing is to be excluded from results
 	 *
-	 * @param bool $excluded Whether this pairing should be excluded in future matching.
+	 * @param bool $excluded This pairing should be excluded from results.
 	 * @throws InvalidArgumentException
 	 * @return $this
 	 */
@@ -135,6 +137,8 @@ public function getScore()
 	}
 
 	/**
+	 * Returns whether this pairing is being excluded from results
+	 *
 	 * @return bool
 	 */
 	public function isExcluded()