Removed using System.Web namespace

If it still spits out errors with URI's, I'll add a little more
encoding.
prints first paragraph of article

Still missing some smarts around detecting if the paragraph is useable
or not, and want to get rid of the using clause on line 18.
fixed comments for docs
Now with better Regex!
Skips paragraphs less than 140 characters long.

There might be a better way to get the substring, the performance seems
a little slow.
Merge pull request #17 from tharax/master

Updated Wikipedia script - now grabs first paragraph