Fixed CDFS config
Fixed problem in namenode start script
Started to switch to memory-mapped I/O
Worked on memory-mapped I/O
Finished implementation of SharedMemoryOutputStream
Started to implement memory-mapped write operation
Optimized cache for memory-mapped I/O
Worked on new implementation of memory-mapped I/O
Removed old I/O classes
Removed old constructor
Finished implementation of memory-mapped I/O