simplify the HttpParser interface

This cuts the HttpParser interface down to #execute and #reset
method.  HttpParser#execute will return true if it completes and
false if it is not.  http->nread state is kept internally so we
don't have to keep track of it in Ruby; removing one parameter
from #execute.

HttpParser#reset is unchanged.

All errors are handled through exceptions anyways, so the
HttpParser#error? method stopped being useful.

Also added some more unit tests to the HttpParser since I know
some folks are (rightfully) uncomfortable with changing stable C
code.  We now have tests for incremental parsing.

In summary, we have:

  * more test cases
  * less C code
  * simpler interfaces
  * small performance improvement

  => win \o/

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