fix tonline testing ini
Fix installation instructions, installation of openssl-devel, and python-devel does not seem to be required on debian (wheezy), but libffi-dev is needed for gsutil
Add parameter cache_dir to configuratin files, to determine where cached files should be stored; default value is /tmp/cloudfusion
    Modify class ConfigurablePyFuseBox to read cache_dir parameter from the configuration file, and set it
    Add parameter cache_dir to constructor of class MultiprocessingCachingStore
    Add parameter cache_dir to constructor of class TransparentMultiprocessingCachingStore
    Add parameter cache_dir to constructor of class ChunkMultiprocessingCachingStore
    Add parameter cache_dir to constructor of class TransparentChunkMultiprocessingCachingStore
Bugfix class ConfigurablePyFuseBox to ignore file system requests on file like /datata/x
Bugfix constructor of class TransparentMultiprocessingCachingStore, to generate a random default value for the parameter cache_id, for every instance of the class
Modify constructor of class TransparentChunkMultiprocessingCachingStore, to generate a random default value for the parameter cache_id, for every instance of the class
fix method delete of class PyFuseBox, to catch notempty exception
Modify buildscript run_tests.sh, to include test transparent_store_test_with_sync, and transparent_store_test_no_sync
Update documentation for developers with examples on how to use the archiving layer implemented by the class TransparentChunkMultiprocessingCachingStore