Agglomerated SSL

This release adds support for OpenSSL 1.0.1c and for TLS 1.1 and TLS 1.2,
falls back to TLS 1.0 on older OpenSSL versions,
uses DH parameters from certs,
always initializes the named curve in order to enable ECDHE,
removes the "version: " prefix from assl_verstring,
adds support for Bitrig,
and adds minor code cleanup.

Support for the latest version of libevent, improved error reporting when loading file certificates, build versioning on Linux to match support on BSD, a function call for stopping the server in the event server example, and other minor code cleanups and enhancements.

This release makes low delay and throughput flags control DSCP for IPv6. It adds a function to set a callback for log information. It fixes an issue with error reporting when getting address information. There are other minor code cleanup and enhancements.

This release adds support for libevent. It adds a NULL encryption option. It adds in-memory certs for privsep servers. It can handle OpenSSL versions 0.9.8 and above. There are many bugfixes and nits.

gets and puts functions were added along with read/write functions with a specified timeout. Support for GCC 4 was improved. assl_poll now works exactly as libc poll. EOF now has the libc semantics. Support for certless applications was added. A callback mechanism was added for dealing with an interrupted assl_serve function. Other small bugs were fixed. The assl functions now mimic libc much more closely, so that a piece of code can be converted from read/write/poll to the encrypted counterpart with minimal effort.