fix for deletes and gets
Merge pull request #398 from nlake44/db-fixes

fix for deletes and gets
Fix exception toss to be passed up to the application
Merge pull request #399 from nlake44/db-fixes

Fix exception toss to be passed up to the application
quoting app key in channel api, in case the user gives us a key with an @ in it
Merge pull request #400 from shatterednirvana/quote-channel-app-keys

quoting app key in channel api, in case the user gives us a key with an @ in it
Merge branch 'testing' of github.com:AppScale/appscale into ds-groomer
Better handling of ZK exceptions