added a constant for the file chunk suffix
Merge branch 'master' into file_chunk_cas_suffix
refactored the FileProcessor + added a CAS suffix to file chunks
client handles file chunks with CAS suffix
swissknife (pull, check) handles file chunks with CAS suffix
Merge pull request #96 from reneme/file_chunk_cas_suffix

File Chunks now use the CAS suffix 'P'

File Chunks are now put into the backend storage using the suffix 'P'. Additionally I refactored the FileProcessor to simplify the distinction between bulk and chunk creation.