Release 5.0.0-alpha2 (#457)

* How/When to upgrade from FA4 to FA5 #454
* Links to SVG files broken in the example files #456
* Misnamed icon names in examples #445
* Mangled HTML in the Getting Started example #442
* Bad grammar and typos #443
* fas-arrow-to-top is identical to fas-arrow-to-right #423
* Vertical alignment issues with webfont implementation #444
* Add browser compatibility tables to demo #435
* Remove MAC OS feces from builds #437
* TTF naming issues that prevent correct usage/installation #450
* Correct CSS for SVG framework stacking, was reversed from normal #452

scss/_variables.scss

@@ -63,6 +63,8 @@ $fa-var-arrow-to-left: "\f33e";
 $fa-var-arrow-to-right: "\f340";
 $fa-var-arrow-to-top: "\f341";
 $fa-var-arrow-up: "\f062";
+$fa-var-arrows: "\f047";
+$fa-var-arrows-alt: "\f0b2";
 $fa-var-arrows-h: "\f07e";
 $fa-var-arrows-alt-h: "\f337";
 $fa-var-arrows-v: "\f07d";
@@ -141,6 +143,8 @@ $fa-var-edit: "\f044";
 $fa-var-eject: "\f052";
 $fa-var-envelope: "\f0e0";
 $fa-var-eraser: "\f12d";
+$fa-var-exchange: "\f0ec";
+$fa-var-exchange-alt: "\f362";
 $fa-var-exclamation: "\f12a";
 $fa-var-exclamation-circle: "\f06a";
 $fa-var-exclamation-square: "\f321";
@@ -149,6 +153,10 @@ $fa-var-expand: "\f065";
 $fa-var-expand-arrows: "\f31d";
 $fa-var-expand-arrows-alt: "\f31e";
 $fa-var-expand-wide: "\f320";
+$fa-var-external-link: "\f08e";
+$fa-var-external-link-alt: "\f35d";
+$fa-var-external-link-square: "\f14c";
+$fa-var-external-link-square-alt: "\f360";
 $fa-var-fast-backward: "\f049";
 $fa-var-fast-forward: "\f050";
 $fa-var-file: "\f15b";
@@ -247,6 +255,7 @@ $fa-var-rectangle-portrait: "\f2fb";
 $fa-var-rectangle-wide: "\f2fc";
 $fa-var-redo: "\f01e";
 $fa-var-redo-alt: "\f2f9";
+$fa-var-retweet-alt: "\f361";
 $fa-var-road: "\f018";
 $fa-var-rocket: "\f135";
 $fa-var-save: "\f0c7";