catching up with recent changes
add API checks
include the sandbox
doc doc updates
Merge pull request #580 from ged-lab/fix/release-checklist14Q3

catching up with recent changes
fix broken docs url
add release notes
multithreading leads to dropped reads
update the release notes too
Merge pull request #682 from ged-lab/doc/681

add release notes and document known issue
Merge branch 'master' of github.com:ged-lab/khmer into update/streaming