add hdfs snapshot/restore module
relates to #72
upgrade to ES 1.0 Beta2
relates to #72
blob implementation for HDFS
relates to #72
hdfs repository
relates to #72
Hdfs plugin
relates to #72
integration test plus resources
fixes #72
improve location of extra configuration

add support for classpath and file in addition to URLs
relates to #72
add dependencies for ES Randomized testing framework
relates to #72
ignore testing framework artifacts
relates to #72
rename hdfs to repository-hdfs
refactor the build system to contain the repository subproject
update build script to publish repository as a separate maven project
polishing