Support for horizontal lazy load in overflow contianer

[StoraH]

This in a starting point to support horizontal lazy load
Still some work needs to be done before it can be merge
Todo:

• width prop with same functionality as height
• support for window horizontal scroll as well

[coveralls]

Coverage remained the same at 75.904% when pulling c4f6ba3 on StoraH:master into d4fde73 on jasonslyvia:master.

[jasonslyvia]

hi @StoraH , thanks for your contribution, though I'm really considering using InstersectionObserver in replace of current implementation, because it saves us a bunch of options (height, overflow and more).
See #129 for more information if you're interested.

[nianiaJR]

will consider to merge this pr? @ameerthehacker

[ameerthehacker]

@nianiaJR before merging this PR I would like to confirm with @StoraH that he has completed the todo and is there anything more to be added to this PR?

[nianiaJR]

@ameerthehacker Ok, I'll use the fork one before you finish this，thanks your reply.