add lock for part.json access (complete last commit)
code reorganization for last commit
add some more info in log messages
Merge pull request #49 from wtangiit/master

add lock for part.json access
Merge branch 'master' of git://github.com/wtangiit/Shock
Merge branch 'master' of github.com:MG-RAST/Shock
added allowable local paths to config, fixed permission denied bug