hook_library and incorrect leaflet path

[cannod]

Had problem getting module to work and tracked it down to hook_library. The leaflet library is installed in "leaflet" directory, not Leaflet.

I'm pretty sure it is supposed to be a lower case 'l'. Changing to $leaflet_core = libraries_get_path('leaflet'); in hook_library() got things working.

[dafeder]

I needed to change the capitalization as well as remove "dist" from the path to conform to how the most recent leaflet module sets things up. Here's a patch of what I did. The other option is to require leaflet.module users to have both a "leaflet" and "Leaflet" dir.

https://gist.github.com/dafeder/7777400