implemented URIResolver for araqne-storage
fix bug log_storage_dir was handled as integer
fixed LocalFilePath.listFiles bug

parameter dir should be parent dir of file.
fixed bug when StorageManagerImpl restarts
add default StorageInputStream.readFully(byte[] b) implementation
add final to member variable
change String URIResolver.getProtocol() to String[] getProtocols()
make DatapathUtil use FilePath
implemented araqne-storage-hdfs

some paths are hard coded
modified araqne-storage-hdfs's dependency to hadoop
refine hard-coded HDFSStorageManagerImpl