* fixbug: prevent image's repeating loading.
* upgrade: fix height when post images use percent width.
* upgrade: remove mobile exclusion.
* upgrade: use new loading icon, more prominent.
* upgrade: add 'simple_lazyload_loading_icon' filter for customizing loading icon.

git-svn-id: https://plugins.svn.wordpress.org/simple-lazyload/trunk@1008074 b8457f37-d9ea-0310-8a92-e5e31aec5664