Buffer stats

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

Conflicts:
	src/connection.c
Merge branch 'buffer_stats' into access_logging
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