html5_video: fix poster behavior on safari (fix #298)
bump to 0.0.74
update CONTRIBUTORS, add @leandromoreira, @Crash-- and @seanhussey
unifies volume changes in a method
adds localStorage support check
adds support to persist volume
persists and restore volume from localStorage
refactors to js stylish
persists sanitized volume
Merge branch 'master' of github.com:leandromoreira/clappr