Updated all application urls to allow path prefix.

Allows BookStack to be installed at a non-root location on a domain.
Closes #40.

app/Providers/PaginationServiceProvider.php

@@ -0,0 +1,30 @@
+<?php namespace BookStack\Providers;
+
+
+use Illuminate\Support\ServiceProvider;
+use Illuminate\Pagination\Paginator;
+
+class PaginationServiceProvider extends ServiceProvider
+{
+    /**
+     * Register the service provider.
+     *
+     * @return void
+     */
+    public function register()
+    {
+        Paginator::currentPathResolver(function () {
+            return baseUrl($this->app['request']->path());
+        });
+
+        Paginator::currentPageResolver(function ($pageName = 'page') {
+            $page = $this->app['request']->input($pageName);
+
+            if (filter_var($page, FILTER_VALIDATE_INT) !== false && (int) $page >= 1) {
+                return $page;
+            }
+
+            return 1;
+        });
+    }
+}