Include static data in dist directory.
Pull static content over the internet.

This isn't automatically updated, but it's "works out of the box."

cbugg: close bug-469
Backport http.ParseTime
Initial doTapDump() implementation.

This is still a work-in-progress as it does not terminate the TAP
stream like regular TAP dump.
HandleMessage() now takes io.Reader param.

TAP message handler, in particular, would be occasionally reading for
TAP_ACK responses from the client.
Function doTapForward().
The doTapXxxx() functions take io.Reader param.
Send TAP_FLAG_ACK on end of tap dump.

With this change, cbtransfer is able to successfully receive tap dump
and server can know that client got everything.

    $ ./cbtransfer http://127.0.0.1:8077 stdout: -b default
    set 0 0 0 1
    1
    set 1 0 0 1
    1
    set x 0 0 1
    1
    set y 0 0 1
    1
    set z 0 0 1
    1
    .
    bucket: default, msgs transferred...
           :                total |       last |    per sec
     batch :                    1 |          1 |       41.6
     byte  :                    5 |          5 |      208.1
     msg   :                    5 |          5 |      208.1
Flipped order of HandleMessage(writer, reader, req) params.

Dustin Sallings pointed out that writers usually come before readers
in idiomatic go.  And, he provided the gofmt magic that made this
easy...

    gofmt -w -r 'x.HandleMessage(a, b, c) -> x.HandleMessage(b, a, c)' *.go