refactoring clarity_elements
changing copyright
introducing clarity_elements_fetcher_role
Transforming clarity_elements_checker into a role.
+ tests
Adding fluidigm_request_volume
+ test
added cherry pick volume
beautification
Merge pull request #59 from benoitmangili/refactoring_clarity_element

Refactoring clarity element
fixing cherrypick_volume
Merge pull request #60 from benoitmangili/fix_cherrypick_volume

fixing cherrypick_volume
Merge pull request #61 from wtsi-clarity/devel

pull from devel to master to create release 0.22