fix(jqLite): Fix next() and its test

[Keyamoon]

next() must return the next sibling element and it should ignore text nodes between elements. In the sample element that was prepared for testing, there was no text or space between the two elements (<b>b</b> and <i>i</i>) to check if next() was ignoring text nodes properly.

To get the next sibling element, nextElementSibling must be used instead of nextSibling because nextSibling doesn't ignore text nodes.

[petebacondarwin]

Much better! Did you say you signed the CLA?

[Keyamoon]

@petebacondarwin Yes, I signed it.

[petebacondarwin]

@Keyamoon Great!

Unfortunately I.E. 8 doesn't like your unit test! http://ci.angularjs.org/job/angular.js-pete/21/testReport/
I have a similar problem with the test in a similar change to jqLite.children() - #1725 (http://ci.angularjs.org/job/angular.js-pete/19/testReport/)

If you can fix one you can probably fix both! Good luck.

[Keyamoon]

@petebacondarwin My implementation of next() uses nextElementSibling which is not supported in IE8. I didn't know there is a requirement for it to work in IE8. I'll add another commit to address that.

[petebacondarwin]

Great this passes the CI: http://ci.angularjs.org/job/angular.js-pete/22/console

[petebacondarwin]

Added it to the Triaged Milestone and will ping core devs to get it merged.

[Keyamoon]

@petebacondarwin Thank you 👍

[IgorMinar]

LGTM. I made a few small changes and squashed the commits into a single commit.
76a6047

waiting for the CI server to verify the changes on all browsers

[IgorMinar]

merged!