Make generateId take a length parameter
Fix a character case issue in file name
Add setFileLoader and setFileSaver to bkHelper
Make eval plugins from init override the preset ones
Fix an issue about default notebook with older version
Minor fix of using '+' in StringBuilder
Check nginx retarting in a different server/port
Minor whitespace clean up in nginx.conf.template
Fix a typo in variable name
Make Main.java in core change according to the restart port change
Merge pull request #238 from twosigma/dev-internal

Dev internal
Make able to config gradle build for core.jar with properties
Merge remote-tracking branch 'origin/dev-internal'
Fix an issue that could cause recent menu item not work
Merge remote-tracking branch 'origin/dev-internal'
Minor, remove unused variables
Merge remote-tracking branch 'origin/dev-minor'
Add isHidden filter
Merge remote-tracking branch 'origin/dev-internal'
set up basic auth to jvm plugin backends