index: renamed current impl to `fallback`
index: added "feature detection" based approach
dom4: added efficient DOM4 mutation observers approach
dom4: improvement courtesy of @marksteve
component: updated
dom4: avoid extra watched loops
dom4: fix break position
dom4: make fewer watched.length checks :P
Merge pull request #2 from component/add/mutations-support

DOM Level 4 Mutations Observers support