Integrate with WP 3.8 Dashboard

Updated post_type icon as well as added post_type count to At a Glance
dashboard widget. Fixes #12
added page-attributes support

fixes #13
update version info
Update Constant Names

Avoids conflicts with other names. Fixes #14
Basic framework done for #15

Testing needs to be done to make sure expected results are attained.
move js file
update paths and broken args
Better Explicit Var Check

Upon execution, PHP was complaining that `$terms` was an undefined
variable. The problem was determined to be an `if()` statement above the
error. That code had existed for quite some time without error, however
the error goes away with an explicit `empty()` check.

Fixes #16

Closes #15
update readme for 1.4 release