add skin_prefix to config
README (skin_prefix)
CHANGELOG
add cache folder to app
.gitignore extended
README typo
gitignore fix
Merge remote-tracking branch 'upstream/master'

* upstream/master:
  gitignore fix
  README typo
  .gitignore extended
  add cache folder to app
  CHANGELOG
  README (skin_prefix)
  add skin_prefix to config

Conflicts:
	README.md