fixed some CSS that was throwing off the margins on the modal in the mobile layout
added 'overflowContainer' option to the config to allow users to select a parent other than the body that contains a vertical scrollbar to be destroyed
Merge branch 'master' of https://github.com/hawsome/importModal

* 'master' of https://github.com/hawsome/importModal:
  Updating the readme to actually be of use.
updated the readme to reflect the current version