Merge pull request #87 from jaredwilkening/master

minor fixes
shock-client fix: pdownload file splitting
specify server-side chunk_size for parallel downloading
Merge pull request #89 from wtangiit/master

bug fix in shock-client pdownload
Merge pull request #90 from jaredwilkening/master

Dual Auth, mgrast auth, improved logging, reorged indexing, and more
Merge branch 'master' of github.com:MG-RAST/Shock
fixed chunksize -> chunk_size
more documentation and clean up