Implementing hashcode and equals for JsonPrimitives as value type equality.
Implementing hashcode and equals for JsonPrimitives as value type equality.

git-svn-id: 7b8be7b2f8bf58e8147c910303b95fa2b8d9948f@419 2534bb62-2c4b-0410-85e8-b5006b95c4ae

CyanogenMod/android_external_gson,eatnumber1/google-gson,Mahdi-Rom/android_external_gson,TEAM-Gummy/android_external_gson,neopeak/google-gson,ThirdProject/android_external_gson,vnc-biz/zcs-lib-gson,byterom/android_external_gson