performance benchmark and other tweaks
added further rationale about tracking and matquery/wrappers. Updated performance benchmarks
added material class usage examples. moved some matquery motivation paragraph to motivation section
updated usr docs with links to example input files
fixed hdf5 backend reference
fixed inline literal issue with one too many ticks, added block literals where appropriate,  and fixed indentation
Merge pull request #26 from gidden/readme_quickfix

fixed inline literal issue with one too many ticks, added block literals...
Merge pull request #25 from gidden/input_links

updated usr docs with links to example input files
Merge pull request #24 from rwcarlsen/cep17-rev3

clarifications after dev list discussion, benchmark updates, and usage examples.
updated readme and makefile to use an origin(your fork)/upstream(cyclus) workflow. feel free to reject his PR if you disagree.
Merge pull request #27 from gidden/remote_fix

updated readme and makefile to use an origin(your fork)/upstream(cyclus)...