Cache dashboard, avoid running queries. (fix #3, fix #5) (#6)

* Update to HM coding standards (fix #5).
* Cached dashboard (fix #3).

.gitignore

@@ -1,2 +1,3 @@
 .idea/
 vendor
+coverage.xml

bin/cache.php

@@ -0,0 +1,21 @@
+<?php
+
+if ( ! defined( 'ABSPATH' ) ) {
+	die( "Run this script with WP-CLI: `wp eval-file bin/cache.php` \n" );
+}
+
+set_time_limit( 0 );
+
+$cache_key = \PressbooksStats\Stats\get_admin_page_html_cache_key();
+
+delete_site_transient( $cache_key );
+
+\PressbooksStats\Stats\cache_stats_admin_page();
+
+$html = get_site_transient( \PressbooksStats\Stats\get_admin_page_html_cache_key() );
+
+if ( empty( $html ) ) {
+	echo "Failed to cache the stats dashboard... \n";
+} else {
+	echo "Successfully cached the stats dashboard! \n";
+}

composer.json

@@ -20,19 +20,16 @@
       "docs": "https://github.com/pressbooks/pressbooks-stats/wiki"
     },
     "require-dev": {
-      "phpunit/phpunit": "5.5",
-      "squizlabs/php_codesniffer": "2.7",
-      "wp-coding-standards/wpcs": "0.10"
+      "phpunit/phpunit": "~5.5",
+      "humanmade/coding-standards": "^0.2.1"
     },
     "scripts": {
       "test": [
         "vendor/bin/phpunit --configuration phpunit.xml --coverage-clover coverage.xml",
-        "vendor/bin/phpcs --config-set installed_paths vendor/wp-coding-standards/wpcs",
-        "vendor/bin/phpcs --standard=phpcs.xml --extensions=php ."
+        "@standards"
       ],
       "standards": [
-        "vendor/bin/phpcs --config-set installed_paths vendor/wp-coding-standards/wpcs",
-        "vendor/bin/phpcs --standard=phpcs.xml --extensions=php ."
+        "vendor/bin/phpcs --standard=phpcs.ruleset.xml *.php inc/ bin/"
       ]
     },
     "require": {