mochi/mochiweb

Make the acceptor crash optional.

So turns out the "Fix for mochiweb_acceptor crash under R15B02" from
#91 was a bug in OTP fixed in R16B.

erlang/otp@6aa9e71

So it worked in R14, was broken in R15 and got fixed in R16.  This commit
makes it such that things will work as well as possible in each version.

In rebar.config I set a compiler option if on R14 or R16, in mochiweb_http.erl
I make the extra R15 clause be added with the macro, then in
mochiweb_socket_server.erl I add in { exit_on_close, false } to the options.

In addition there is a script which will detect if the fix is needed based
on my test case from issue 91.

Just run 'make ; cd scripts ; ./check_for_gen_tcp_fix.erl' and it should
return true if the fix is in place.

…ed versions

replace now() with os:timestamp() in acceptor

Session module for managing session cookies

…regression

fix mochiweb_response regression

use tuple modules instead of parameterized modules

Erlang R16, coming soon, will do away with parameterized modules (see Issue
4 under http://www.erlang.org/news/35 for details). Change Mochiweb to use
tuple modules instead, since they will continue to be supported in R16 and
beyond. These changes are backward compatible, so current Mochiweb
applications should require only recompilation to continue working.

…really understan the security implications of this. There is no term_to_binary in the code now.