Added fading diagonal animations

[vaibhav111tandon]

Added fading animations through diagonals for both fadeIn and fadeOut

TopLeft
TopRight
BottomLeft
BottomRight

[eltonmesquita]

Please see https://github.com/daneden/animate.css#contributing and update this PR.
Thanks.

[vaibhav111tandon]

Demo:
https://codepen.io/Vaibhav119/full/yWoYJW
and classes are in camelCase

[warengonzaga]

@vaibhav111tandon these are good... @eltonmesquita we can add these animations on v4

[eltonmesquita]

Hey @vaibhav111tandon , thanks for the PR!
Although they are totally consistent with the fade entrances/exit, they didn't feel "natural" to me. This feel makes me ask:
Do we really need diagonal entrances/exits?
I would love to hear some opinions here...

[vaibhav111tandon]

Sir,
it is your library, therefore it is totally your decision to merge this request or not, if you don't find it appropriate, it's totally ok.

[eltonmesquita]

@vaibhav111tandon, this is not my library, it's an open source library 😄

There were many times people showed me here that my opinion was not the best for the library and we ended up merging the PR. And as I asked before, I'm not sure, so I need some feedback to make a decision.

Any thoughts about the question I've done?

[warengonzaga]

@vaibhav111tandon fyi... this is not elton's library it is an open source library there so many contributor here including me.. so that... it is a public library for everyone... for me... @eltonmesquita we can add this animations as extras or misc since it is not necessary in any animation (kind of optional animation for extra spices).

[vaibhav111tandon]

@warengonzaga I think adding them as misc. will be good

[eltonmesquita]

Sorry for the delay, but I've changed my mind and it'll get released on v4!

You can see a preview here: https://codepen.io/eltonmesquita/full/agrYzj

[eltonmesquita]

BTW it's merged on the dev as you can see on 793b0ff

[vaibhav111tandon]

Thank you very much 😊

[warengonzaga]

@eltonmesquita @vaibhav111tandon good job guys... see you on V4

[warengonzaga]

@eltonmesquita kindly close this since it is added in v4
current development progress at #1029

[warengonzaga]

@daneden kindly review this and close if necessary...