Initial version 5.1

• Update README.
• Improve examples' scripts.
• Change option about alingment temp directory.
• Add options to control the number, memory and cores of executors in alignment and profiling process separately.
• Support output of alignment results to local file system.

Initial version 4

Release Notes:

• This version could be deployed and executed on YARN-based distributed system.
• Local mode is NOT supported well in this version.