Use the rake helper for mkdir as this version makes two folders on Windows
Merge pull request #2118 from mscharley/windows-support
Update history to reflect merge of #2118 [ci skip]
Properly clean path for Windows machines which is *nix-compliant.
Properly strip drive name from clean path when sanitizing path.
Remove obsolete `normalize_options`.
Trim trailing spaces and convert tabs to spaces.
Merge pull request #2121 from XhmikosR/docs
Update history to reflect merge of #2121 [ci skip]
Merge pull request #2109 from jekyll/proper-path-cleaning
Update history to reflect merge of #2109 [ci skip]
Merge pull request #2122 from XhmikosR/whitespace
Update history to reflect merge of #2122 [ci skip]
Update normalize.css to v3.0.0.
Losslessly compress images.

Before: 89,5 KB (91.747 bytes)
After:  87,4 KB (89.573 bytes)
Merge pull request #2128 from XhmikosR/compress-images
Update history to reflect merge of #2128 [ci skip]
Merge pull request #2126 from XhmikosR/normalize.css
Update history to reflect merge of #2126 [ci skip]