fix errors when build on other platforms

[Magicqy]

fix SetValue method in CrittercismAndroid, use AndroidJavaObject to create JSONObject instance, not AndroidJavaClass CrittercismConfig should not be a sub class of MonoBehaviour , create instance of MonoBehaviour is invalid using keyword 'new' add a SetMeta button in TestGUI script recommend: using AndroidJavaObject and AndroidJavaClass are really expensive in C#, consider add some overload methods in java sdk to create java Object instances in java side, see Comments in SetValue method in CrittercismAndroid

[dshirley]

:ship: it

[dshirley]

Thanks!