Removed redundant imports
Housekeeping
Added find_fluidigm_sample_by_plate method
Added a class for iRODS paths

Added a class for Fluidigm assay result data

Added Fluidigm metadata updater
Moved Fluidigm classes into their own package
Added missing import
Downgraded warning of existing metadata because it is a common and
expected occurrence

Added Perldoc
Handle empty wells from the Sequencescape warehouse; it simply omits
them, therefore not finding a well is not an error(!).
Export remove_group (previously unused because there were no admin
rights).

Handle empty wells from the Sequencescape warehouse; it simply omits
them, therefore not finding a well is not an error(!).
Merge branch 'devel' of github.com:keithj/genotyping into devel
Merge pull request #159 from keithj/devel

iRODS and Fluidigm updates