Add the "compass-animate" gem.
Tidy generated CSS – now we have an %extend in _mixins.sass but shortened the CSS by ~300 lines.
Revert "Add the "compass-animate" gem."

This reverts commit 5c62377cf4be8af4f1d78b64e3682388c7af3042.
Introduce sass/modules/icons.
Center small infinite-scroll loading animation for "headerAlignment:center".