Should solve #58
Changing the way we manage the callback handle id. Since same instance is used from plugin registry for all plugin callbacks and plugin callbacks are sort of async after first call to 'call' method in a plugin, it's important that callbackHandle lives in intent that an instance varaible of class; as the latter can potentially be overridden.
If data passed is null, then we do not call toString() on it. null will eventually get converted to 'null' as string once it passes through bridge. For now apps willneed to handle this representation of null as well on either end.
Merge pull request #59 from rcarragher/issue58

Sass/Scss Partials shouldn't be compiled, and sub-directories should be preserved
Merge pull request #98 from priyaaank/plugin_callback_handle_fix

Alert Plugin uses a better pattern to manage callback handle id
Merge pull request #99 from priyaaank/plugin_data_npe_fix

Fix null pointer error for android plugins, when null data is passed
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