Add support for choosing videos

[rafsanjani]

I've been using this very useful library a lot so I decided to add the support for choosing and taking videos. I have also upgraded all dependencies to latest versions and made appropriate syntax corrections where necessary.

This can be activated by passing an optional parameter pickerType to the newInstance method. By default only photos can be selected.

MediaPickerFragment.newInstance(
        multiple = true,
        allowCamera = true,
        pickerType = MediaPickerFragment.PickerType.VIDEO, //required for video mode
        maxSelection = 5,
        theme = R.style.ChiliPhotoPicker_Dark
    ).show(supportFragmentManager, "picker")

Almost every core class has been renamed (apparently we can't keep the photo prefixes because there is video suppport now) so this enhancement causes a breaking change. These are the classes that have changed.

Old name	New Name
SelectablePhoto	SelectableMedia
PhotoPickerFragment	MediaPickerFragment
PhotoPickerAdapter	MediaPickerAdapter

Consumers of this class only need to worry about renaming PhotoPickerFragment to MediaPickerFragment and the callback from PhotoPickerFragment.Callback to MediaPickerFragment.Callback

Everything else remains the same.