Compression Format, Quality

[cohortor]

First, thank you for building this rather useful plugin!!

If I may, I would suggest adding the ability to set at least the quality (maybe even the format) of the output files via the plugin APIs.

As of version 0.3.4 (in Android), bitmap.compress() is called with the hadrcoded params of Bitmap.CompressFormat.JPEG, quality=100.

Looking at any one of the graphs comparing JPG image quality versus output file size, I would argue quite a few (perhaps even most) use cases would benefit from a compression quality value less than the current 100 for the output images generated by this plugin.