refactor text2bin
support adfea
move io.h into file.h/cc, file can open a DataConfig conf
refact matrix_io.h
rename functions in file.h
read ascii hdfs file into protobuf
rcv1 runs fine
fix adfea bug in parse_text
modify output format
add capacity_ in shared_array
add reserve in shared_array
let worker read the data info, and gathered by the scheduler
fix the tiny bug when there are servers with empty keys