Adds the Tiki Bar background and adjusts background credits

Adds the Tiki Bar background by Zeuses-Swan-Song. This will be the default background during the upcoming Summer event.

This commit also adds/adjusts some background credits. It's quite tricky to track down who originally made the backgrounds in SPNatI. If anyone knows who originally made backgrounds like Locker Room or Hot Springs, please shoot me a message!

js/spniOption.js

@@ -23,10 +23,16 @@ var backgrounds = {
         name: "The Inventory",
         author: "Zeuses-Swan-Song",
         location: 'indoors'
+    }),
+	'tiki bar': new Background('tiki bar', 'img/backgrounds/tiki_bar.png', {
+        name: "Tiki Bar",
+        author: "Zeuses-Swan-Song",
+        location: 'outdoors',
+        time: 'day'
     }),
     'beach': new Background('beach', 'img/backgrounds/beach.png', {
         name: "Beach",
-        author: "u/SPNATI",
+        author: "u/SPNATI & Patisdom",
         location: 'outdoors',
         time: 'day'
     }),
@@ -55,7 +61,7 @@ var backgrounds = {
     }),
     'mansion': new Background('mansion', 'img/backgrounds/mansion.png', {
         name: "Mansion",
-        author: "u/SPNATI",
+        author: "Anymouse-68",
         location: 'indoors',
         time: 'night'
     }),
@@ -82,12 +88,14 @@ var backgrounds = {
     }),
     'haunted forest': new Background('haunted forest','img/backgrounds/haunted_forest.png', {
         name: "Haunted Forest",
+        author: "UnderscorM3",
         location: 'outdoors',
         time: 'night',
         filter: 'brightness(0.7) saturate(0.9)'
     }),
     'romantic': new Background('romantic', 'img/backgrounds/romantic.png', {
         name: "Romantic",
+        author: "Patisdom",
         location: 'indoors'
     }),
     'classic': new Background('classic', 'img/backgrounds/classic.png', {