- Most metric name checks in the procstat parser now use plain C string
    matching instead of regular expressions
- Overhead has been reduced to 1.09% for a full vmstat + meminfo +
    procstat instantiation on a CoolMUC3 node (2700+ metrics each sec)
- Overhead for a minimal meminfo instantiation is 0.05% (44 metrics)
- We can safely assume linear scaling of the plugin in function of the
    number of metrics

- Switch from the STD regex library (which apparently is incomplete for GCC < 4.9) to the BOOST one
- Plugin is stable and tested on a CoolMUC3 node
- Current overhead for a full vmstat + meminfo + procstat instantiation is 1.3% on a CoolMUC 3 node with 256 (logical) cores
- More optimization work to come

- Supports sampling of the vmstat, meminfo, and stat files in the proc virtual filesystem
- Basic functionality verified, extensive testing to come in the next days
- Readme and Makefile have been updated as well