rewrite lifecycle hook system
shave off a few bytes with forEach
make sure a vm and its data are properly removed from Array when $destroy is called directly
readme
reintroduce v-style
update todomvc example to be same as lended version
add isLiteral option for custom directive
Fix IE directive not compiled issue

In the TodoMVC example, when `v-show` is compiled first, it adds an
inline style attribute to the node. Since IE seems to handle the order
of attributes in `node.attributes` differently from other browsers,
this causes some directives to be skipped and never compiled. Simply
copy the attribtues into an Array before compiling solves the issue.
Release-v0.8.4