Added the ability to prevent duplicate toasts from piling up using an extra option.
Update toastr.js
Added unit tests for PR
no message
Consistent naming conventions in comments
Bump
Merge pull request #163 from SBero/master

Prevent duplicates from piling up option.
Merge pull request #168 from mullen3/master

Consistent naming conventions in comments
Merge pull request #170 from durango/master

Fixes toastr for npm/browserify
add travis image
karma testing
caching node modules for travis
karma wants qunitjs peer dependency
no bower
karma setup for CI
added real tests back

doh!
Updating docs to show how timeouts work.
updated readme, changelog and versions for upcoming 2.1.0 release
Update demo.html as issue 180.

this is my first or second time doing a pull request on git. 
I don't know how to attach to https://github.com/CodeSeven/toastr/issues/180
Merge pull request #181 from Bartmax/master

Update demo.html as issue 180. Thanks!