Fix push.js transition ending listener for Firefox

[pistou]

Firefox fire the event "transitionend"

https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Using_CSS_transitions#Detecting_the_completion_of_a_transition

[XhmikosR]

We need to make this a function which will use the right event based on the browser instead of duplicating code.

[XhmikosR]

Something like I'm trying to do in #491 but I don't like it so much yet thus not merged.

[cvrebert]

It's not clear if Android Firefox is officially supported (see http://goratchet.com/getting-started/). But this is the standard-compliant event name, so adding it seems like a good idea regardless.

[XhmikosR]

Well, duplicating things like that isn't nice. My solution seems to work, I just need some feedback.

[XhmikosR]

@Johann-S: can you confirm that this is redundant now in the current master?

[Johann-S]

Yes It's redundant, but i think we will have to fix push.js using getBrowserCapabilities to get
the right prefix and remove or add the right event listener for the right browser.

[XhmikosR]

Indeed. Can you make a new PR to tackle that please?

[Johann-S]

Yes sure I'll work on it !

But I'll also include my futur new PR to fix push.js when it will be merged on the refactoring (#745) because I'll duplicate code to use getBrowserCapabilities

[XhmikosR]

OK, closing this then and we'll try to merge #745 first.