Removed all instances of 'ride' in favor of 'activity'

Removed all extract()
Updated code standards and documentation
Update readme

lib/SOMMetric.class.php

@@ -1,46 +1,75 @@
 <?php
 
+/**
+ * SOM Metric class.
+ *
+ * All conversions are limited to 2 decimal places.
+ */
 class WPStrava_SOMMetric extends WPStrava_SOM {
+
 	/**
-	 * @param $m meters
-	 * @return string km
+	 * Change meters to kilometers.
+	 *
+	 * @param float $m Distance in meters.
+	 * @return float Distance in kilometers.
 	 */
 	public function distance( $m ) {
 		return number_format( $m / 1000, 2 );
 	}
 
 	/**
-	 * @param string $dist km
-	 * @return string meters
+	 * Change kilometers to meters.
+	 *
+	 * @param float $dist Distance in kilometers.
+	 * @return float Distance in meters.
 	 */
 	public function distance_inverse( $dist ) {
 		return $dist * 1000;
 	}
 
+	/**
+	 * Abbreviated label for this system of measure's distance - Kilometers: km
+	 *
+	 * @return string 'km'
+	 */
 	public function get_distance_label() {
 		return __( 'km', 'wp-strava' );
 	}
 
 	/**
-	 * @param $mps
-	 * @return string km/h
+	 * Change meters per second to kilometers per hour.
+	 *
+	 * @param float $mps Meters per second.
+	 * @return float Kilometers per hour.
 	 */
 	public function speed( $mps ) {
 		return number_format( $mps * 3.6, 2 );
 	}
 
+	/**
+	 * Abbreviated label for this system of measure's speed - Kilometers Per Hour: km/h
+	 *
+	 * @return string 'km/h'
+	 */
 	public function get_speed_label() {
 		return __( 'km/h', 'wp-strava' );
 	}
 
 	/**
-	 * @param $m meters
-	 * @return string meters
+	 * Change meters to meters };^)
+	 *
+	 * @param $m Elevation in meters.
+	 * @return string Elevation in meters.
 	 */
 	public function elevation( $m ) {
 		return number_format( $m, 2 );
 	}
 
+	/**
+	 * Abbreviated label for this system of measure's elevation - Meters: meters
+	 *
+	 * @return string 'meters'
+	 */
 	public function get_elevation_label() {
 		return __( 'meters', 'wp-strava' );
 	}