Fixing typos and checks

Typo in examples

They say that every programmer builds a web framework at some point. This one is
mine.

The basic idea behind this one is that I wanted a Sinatra for Go, and I couldn't
find one anywhere. Furthermore, net/http is in many ways really close to what I
want out of a Sinatra-in-Go, and many of the frameworks I did find seemed to
reinvent too much, or were incompatible with net/http in weird ways, or used too
much questionable reflection magic. So long story short, I wrote my own.

This implementation is only half-baked, and among other things it's missing a
whole lot of tests.