Makes path param in startRecord to behave as a path on iOS

[escobar5]

The path parameter of the method startRecord behaves as a path on Android, where you can pass for example 'sdcard/hello.mp4'. On iOS it was only supporting the fileName, this fix makes the function consistent between iOS and Android, both now can take a path.

Fixes #90

[hyochan]

Approve this PR.

[mdathersajjad]

Can you please update the README regarding the same in tips section it has been mentioned if we give file name sound.m4a we will get back the file URI previously it used to return temporary path plus the file name now we have to pass the whole path and to get the file path we have to include library like react-native-fs or write a custom native module to get the temporary file path. As a suggestion you can add a constants in both android and ios to get the temporary path it will be really helpful. If you want i can open a pull request for the same. Also the path /sdcard/sound.mp4 would be available or not depends on the phone manufacturer. Different vendors put the path in different places.

Thanks

[hyochan]

Please give us a PR to help us maintain the module!