Add animate documentation, closes #72.
Convert css to scss with compression.
Add .sass-cache to .gitignore.
Implemented post update date and reading time.

Update date is shown if it is defined in the post's front matter.
Merge pull request #73 from WrinklyNinja/post-metadata

Implemented post update date and reading time.
Add small class to minutes read meta data.
Ensure site title is centered on mobile, closes #75.
merge with upstream
week3