Added two utility functions.

src/main/java/ca/recrown/islandsurvivalcraft/world/BiomeSelector.java

@@ -172,6 +172,14 @@ public class BiomeSelector {
         return Biome.BEACH;
     }
 
+    public boolean isOceanBiome(Biome biome) {
+        return oceans.containsKey(biome);
+    }
+
+    public boolean isLandBiome(Biome biome) {
+        return !isOceanBiome(biome);
+    }
+
     /**
      * Randomly selects a land biome that fits in given temperature.
      * @param temperature Minecraft temperature to select biome from.