Updated project for bootstrap 4, alpha 2

[justin808]

• Added support for postcss and tether for Bootstrap 4.
• Added font-awesome example usage (no glyphicons in Bootstrap 4).

Things to do someday:

• It's pretty non-dry for the examples.
• I couldn't get the extract-text-plugin to work with font-awesome unless I removed the url-loader limit of 10000.

[justin808]

@lazzrek @alexfedoseev @RazkoSA @vjpr please review.

[byteslicer]

Thanks for creating this Pull request @justin808 . I found some issues:

• Duplicate 'postcss-loader' in both package.json files.
• Is it not redundant to require "postcss" if its already installed via postcss-loaders dependency?
• Move all loaders to "devDependencies"

[justin808]

@lazzrek Can you please attach your comments to lines of code. Click the "Files Changed" tab or go into Reviewable. Thanks.

[justin808]

@alexfedoseev @wmadden We need to figure this one out. We should be able to have the url limit when doing a prod (extract-text-plugin) deployment.

• http://stackoverflow.com/questions/34133808/webpack-ots-parsing-error-loading-fonts
• http://stackoverflow.com/a/34133809/1009332
• http://stackoverflow.com/a/30763977/1009332

[alex35mil]

Looks good, merging 👍