build: Move mockwebserver from compile to testCompile (#501)

Fixes #500

Author: harshavardhana

build.gradle

@@ -47,13 +47,13 @@ subprojects {
         compile "com.google.http-client:google-http-client-xml:1.20.0"
         compile "com.google.guava:guava:18.0"
         compile "com.squareup.okhttp:okhttp:2.7.2"
-        compile "com.squareup.okhttp:mockwebserver:2.7.2"
         compile "com.squareup.okio:okio:1.6.0"
         compile "joda-time:joda-time:2.7"
 	compile "com.fasterxml.jackson.core:jackson-annotations:2.8.4"
 	compile "com.fasterxml.jackson.core:jackson-core:2.8.4"
 	compile "com.fasterxml.jackson.core:jackson-databind:2.8.4"
 
+        testCompile "com.squareup.okhttp:mockwebserver:2.7.2"
         testCompile "junit:junit:4.12"
     }