Export event_extra not event_extras.
add a cast to https-client.c
Initialize async bufferevent timeout CBs unconditionally

This is a fix for bug #93 on nmathewson/Libevent.
Fix duplicate paragraph in evbuffer_ptr documentation
Fix consts in WIN32-Code/getopt*.[ch]
Heap-allocate zlib data structure in regress_zlib tests
Add an include to evrpc-internal to fix openbsd compilation warning
Skip http/ipv6_for_domain test when we have no ipv6 support
Add missing include to regress_finalize.h
Avoid double-close paths in http tests

Coverity spotted that there were some paths through the test
functions that would double-close some sockets.
Bring changelog up to date for 2.1.4-alpha
Increment version to 2.1.4-alpha
Add new APIs to whatsnew-2.1