add LDAP schemas
add dcm4chee-storage-test
replace StorageSystemProvider.checkStatus() by StorageSystemProvider.checkWritable() and StorageSystemProvider.getUsableSpace()
implement jclouds StorageSystemProvider
Add shutdown hook to CloudStorageSystemProvider
added mulipart uploader for aws-s3 and openstack swift
fix merge errors
add CloudStorageSystemProviderTest and MultipartUploaderTest
merge jclouds branch