Merge branch 'charngda'

Conflicts:
	config
	config.ib_intel
	monitor/Makefile
	monitor/config.ranger
Add support for optional extensions
Merge branch 'charngda'

Conflicts:
	config
	config.ib_intel
	monitor/Makefile
	monitor/config.ranger
Added support for reading slurm cgroup information
Added configuration settings for rush and added slurm and procdump
extensions to the build.
Added unit-test harness that is to be used for testing the tacc_stats c code.