unit tests: use memoryAdapter for store in sync-suite to prevent side-effects that make other tests fail
unit tests: use memoryAdapter for store in sync-suite to prevent side-effects that make other tests fail

untitaker/remotestorage.js,theWebalyst/remotestorage.js,lewisl9029/remotestorage.js,mcanthony/remotestorage.js,theWebalyst/remotestorage.js,remotestorage/remotestorage.js,remotestorage/remotestorage.js,lewisl9029/remotestorage.js,untitaker/remotestorage.js,remotestorage/remotestorage.js,mcanthony/remotestorage.js