Add the async client to the startup script.
Add the async client to the startup script.

Allow setting the java version to use via the "JAVA_HOME" environment
variable. Fixes #252.
manolama/YCSB,leschekhomann/YCSB,manolama/YCSB,ChristianNavolskyi/YCSB,ChristianNavolskyi/YCSB,zyguan/ycsb,cricket007/YCSB,madhurihn/YCSB_ToyDB,zyguan/ycsb,cricket007/YCSB,jaemyoun/YCSB,brianfrankcooper/YCSB,leschekhomann/YCSB,leschekhomann/YCSB,madhurihn/YCSB_ToyDB,cricket007/YCSB,zyguan/ycsb,madhurihn/YCSB_ToyDB,jaemyoun/YCSB,brianfrankcooper/YCSB,ChristianNavolskyi/YCSB,jaemyoun/YCSB,manolama/YCSB,cricket007/YCSB,brianfrankcooper/YCSB,ChristianNavolskyi/YCSB,jaemyoun/YCSB,leschekhomann/YCSB,zyguan/ycsb,brianfrankcooper/YCSB,manolama/YCSB,madhurihn/YCSB_ToyDB