Un-depricate x-init, add returned callback behavior, and depricate x-…

…created & x-mounted

Re-introduce x-init to avoid breaking change

Make "el" not return a proxy

Add $el, change x-init to x-created and x-mounted, and improve reacti…

…vity

Add short syntax: @ and : && fix class binding to string output

Add $nextTick magic function

Fix "Invalid invocation" error when referencing $refs

Upgrade version && write docs for x-init

Upgrade version && write docs for x-init

Add documentation for x-html