The non-minified version of the Long dependency should be used when creating osc.js builds

[colinbdclark]

Currently, we're including the minified version of the Long dependency in our non-minified concatenated builds such as dist/osc-browser.js. This means that the debugger will try to load a source map for it, and won't find it.

We should ensure that our concatenated builds are created from the non-minified version of Long.js.