Use jquery.<name>.js for main source file

Popular convention is to name source files of jQuery plugins
with a "jquery." prefix.

From the documentation at: http://plugins.jquery.com/docs/names/

> Match your plugin name to your file name,
> e.g., the foo plugin would live in a file named jquery.foo.js.
Merge pull request #15 from hkdobrev/jquery-naming-convention

Use jquery.<name>.js for main source file