Use indexOfElement in JsonReader.

This means we don't need to re-navigate through the segments
for every single character. Should be a small performance win.

pom.xml

@@ -26,7 +26,7 @@
     <java.version>1.6</java.version>
 
     <!-- Dependencies -->
-    <okio.version>1.0.1</okio.version>
+    <okio.version>1.0.2-SNAPSHOT</okio.version>
 
     <!-- Test Dependencies -->
     <junit.version>4.11</junit.version>
@@ -58,6 +58,11 @@
         <artifactId>junit</artifactId>
         <version>${junit.version}</version>
       </dependency>
+      <dependency>
+        <groupId>com.squareup.okio</groupId>
+        <artifactId>okio</artifactId>
+        <version>${okio.version}</version>
+      </dependency>
     </dependencies>
   </dependencyManagement>