Add prefixes to CSS classes

[mrchess]

Added $prefix in the CSS, and a baseCSSPrefix class in the JS.

Also added a global in the JS where you can specify theme, and a simple test file.

This commit fixes issue #4.

Cheers.

[mrchess]

I ended up prefixing everything in the SASS instead of replacing "messenger" so that it could be completely scoped. There was also a small classname dependency on bootstrap for the "block" theme that I didn't scope, but I made a comment in the coffee file.

[zackbloom]

Thanks for writing it up. I would merge if messenger- was the prefix, meaning you could change it. That would help people potentially using bootstrap themes that prefix alerts. I don't like the inclusion of the 'hubspot-' default in a public repo, and also don't think its necessary for everything to be double-namespaced.

[mrchess]

I think I removed all the things you were concerned about with this commit. Got rid of double namespacing, and now everything is just "messenger". Basically the CSS is like how it was originally, except now you can specify a prefix if you want.

You can test w/ different themes in the test.html file (gotta rebuild tho when you change theme in the coffee).

[zackbloom]

I'm closing this because I haven't seen enough support from the community that it's necessary.