Merge pull request #17 from scopatz/source

Proposal for Cyclus Enhancement Proposals . Excellent plan @scopatz .
added rwcarlsen's resource tracking CEP as #17
updated cep17. Added floating point and threshold functionality recently done by Katy. Added quality back to generiresource. Other minor tweaks.
Merge pull request #20 from rwcarlsen/cep17-rev2

updated cep17. Added floating point and threshold stuff and quality to GenericResources.
remove log tour from docs - it is very badly out of date
fixes cyclus/cyclus#458. Updates output database page to discuss newest incarnation
Merge pull request #22 from rwcarlsen/new-dbase

Updates output database page to new event architecture
Merge remote-tracking branch 'upstream/source' into source