Updating readme to use LoveVideo instead of love.video

Closes #3
Replacing main.lua examples of love.video with LoveVideo

Part of #3
Adding comments to info.lua.template metadata file
Adding a multitude of changes from @shell64

Adding srgb argument to love.newVideo
Adding setSpeed and getSpeed for video playback speed
Correcting typo of `formate`
Adding isCompressed function to determine if it is a compressed image type
Removing superfluous collectgarbage()
Adding setOnDone for an on done callback.