Minor fixes

**Issue by [shchurov](https://github.com/shchurov)**
_Monday Dec 14, 2015 at 14:26 GMT_
_Originally opened as https://github.com/android/android-MediaRecorder/pull/3_

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Some devices may not support all the sizes from getSupportedPreviewSizes() list for video recording. For this purpose camera api has method getSupportedVideoSizes(). Also MediaRecorder.stop() can throw an exception (check the docs) that should be handled.

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_**[shchurov](https://github.com/shchurov)** included the following code: https://github.com/android/android-MediaRecorder/pull/3/commits_

Locate the media-recording entry point that uses getSupportedPreviewSizes() and MediaRecorder.stop(), then read the Android media API documentation for getSupportedVideoSizes() and stop() exceptions. Done means video recording selects supported video sizes and handles a stop exception without crashing.

Written by the indexing model from the issue text.