TODOS

TODOs:

extract LineReader from LineRecordReader
add example 

- [ ] input progress
- [ ] Counters
- [ ] job submitter
- [ ] Terasort TotalOrderPartitioner
- [ ] add google sparse hash
- [ ] add test for partition bucket combiner
support parallel sort & compression
SequenceFile reader

reimpl simple_memcpy & fmemcmp & fmemequ
mvn package
add synchronize to important methods
use inline functor rather than function in merge
Java input/output stream
iobuffer refactor to use input/output stream
compress refactor
compress support zlib
record reader/writer interface
include file api