Mention default and possible values for each setting

[dchekanov]

It would be nice to know the default and possible values for settings.
Something like the following:

Name	Possible values	Default value	Description
mode	'slide', 'fade'	'slide'	What kind of animation to use when transitioning between images

Let me know if you need some help with this (#26 should probably be resolved first).

[sachinchoolur]

HI @dchekanov,
I have some urgent works and i am running out of time.
It would be grateful if you could help me.

Thanks,
Sachin N.