Fix IE11 beginPath #198 #194
Add UMD declaration

In order to require this plugin using Require JS or another AMD system
both this plugin and JQuery itself must be AMD-compatible. This PR adds
the Universal Module Defintion pattern from https://github.com/umdjs/umd
so it works as expected with AMD and with traditional methods of
inclusion.
loosen jquery version dependency

The previous jQuery version dependency tied the plugin to version 1.7,
not 1.7.1 or higher. I'm assuming this is compatible with 2.X too, so
loosened it to >=1.7. If it's not 2.X compatible, you could tighten it
to ~1.7 for all 1.X releases after 1.7
Merge pull request #202 from fidothe/add-UMD-declaration

Add UMD declaration
Merge pull request #204 from fidothe/fix-jquery-bower-dep

loosen jquery version dependency