add dashboard demo with link to live demo via rawgit
fix init process

Set $element before calling setOptions. fixes #49.

Made gridster directive have isolate scope.

moved config watch function to post link. Removed redundant pre link
code.
Merge pull request #62 from jdewit/fix/init

fix init process
Merge pull request #59 from jdewit/update/demo

add dashboard demo with link to live demo via rawgit