Added additional classes

[lukemorton]

I have added additional classes for styling particular characters, words and sentences by their contents and not just a counter. This allows font changes for certain letters and numbers, easier control over sentences (as long as the contents does not change), etc.

Luke

[lukemorton]

var nonAlphanumeric = /[^a-z0-9_]/gi;

Shouldn't have the underscore, no need for any other characters apart from letters and numbers IMO.

[davatron5000]

I really like your solution, but I politely disagree that it only needs to be alphanumeric. I think the plugin should do its best accomodate non-English languages like Japanese or that weird German ß thing.

I also thing supporting punctuations like amperstands, quotes, and exclamation points would be extremely useful typographically.

What might be smart is to roll out a letterize submethod that will incorporate your code and/or add classes optionally in the meanwhile. I know a lot of people want this ability. Thoughts?

[lukemorton]

Yeah I totally overlooked typography for non alphanumerics! I think the HTML entity equivalents would be the best solution i.e. standard quotes could be represented by .charquot, or perhaps just .quot, .amp for &, etc.

I think things get complex for full UTF 8 support however. It's getting late in England though, so I think I might revisit this tomorrow. Anyway great work on the plugin!

[maranomynet]

I'm not too fond of this particular class-name based approach.
Will roll my own now and send you a PR.

[davatron5000]

Going to put momentum here into #45. Thanks for your original commits @drpheltright. Appreciate it.