Buffer stats

Track data sent and received in each buffer.
Merge branch 'master' into buffer_stats

Conflicts:
	src/connection.c
More verbose comments in example configuration file
initialise port to 0, wildcard address test fails on OSX
initialize port only if addr is not NULL
Merge pull request #63 from bearnard/master

initialize port to 0, wildcard address test fails on OSX
Merge branch 'master' into nonblocking-connect
Merge branch 'buffer_stats' into access_logging
Bind explictly to 127.0.0.1 for test suite, fixes connection_reset_test and bad_request_test under OpenBSD
Access logging

Basic access logging functionality (to error log).
Use clock_gettime() instead of gettimeofday() to avoid /etc/localtime lookups
Seperate access logging
Remove clock_gettime check from configure.ac
Add linker flags to tests/Makefile.am
Update TODO

Fixes #65. [ci skip]
Merge pull request #68 from dlundquist/access_logging

Access logging
Merge remote-tracking branch 'github/master' into nonblocking-connect

Conflicts:
	src/connection.c