Fixed published package on npm

This release includes only the fix of the npm release

Bugfixes:

• #7

Support for retina square markers

We are in the process of getting things together.

We received a few PRs and took some suggestions from fellow coders.

Just release version 2.0.4 with some improvements, such as bower and npm support (updated bower version and npm's)

If there is anything we can do better, let us know.

Adding support for mapicons square markers

Adding support for mapicons square markers