Initial import of the source files
Initial import of the derived files for those who don't want to install cweb
Initial import of the unittests
Add README file
Fix typos
Missed critbit.h (thanks to sfossen for the heads up)
Update discussion of bit ordering.

As pointed out by Stefan Webb, the previous version was confusing. It contained
a diagram where bits were counted from the left, but then talked about
least-significant bits. Although DNS RFC authors disagree, most people consider
the least-significant bit to be on the left.

Since the tree can be defined for whatever ordering you wish, I've removed talk
of bit significance.
Fix the logic around x & (x - 1)

Thanks to Nolan Waite for pointing out the flaw.
Use a faster "SWAR" algorithm to find MSB.

See http://aggregate.org/MAGIC/#Most Significant 1 Bit
Merge pull request #3 from jasondavies/msb

Use a faster "SWAR" algorithm to find MSB.
Fix typo: "PATRICA" -> "PATRICIA".
Merge pull request #4 from jasondavies/typo

Fix typo: "PATRICA" -> "PATRICIA".