Merge pull request #93 from xuy/master

Use DB-backed session for MicrobesFlux
Merge pull request #95 from xuy/master

Make our tests idempotent, explicitly list file operations in tests
Merge pull request #97 from xuy/master

do not use absolute task_id in tests
Revised readme.md, merged scripts folder
Merge branch 'master' of https://github.com/xuy/MicrobesFluxSource
Merge branch 'master' of https://github.com/microbesflux/MicrobesFluxSource