This is a major breaking change to web.C, the Goji context object. The
Env key has been changed from a map[string]interface{} to a
map[interface{}]interface{} in order to better support package-private
environment values and to make the context value more compatible with
golang.org/x/net/context's Context.

Since strings support equality, most existing uses of web.C should
continue to function. Users who construct Env by hand (i.e., by calling
"make") will need to update their code as instructed by their compiler.
Users who iterate over the environment will need to update their code to
take into account the fact that keys may no longer be strings.

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.