lib/Labware/Plate.pm
    Changed return_all_wells to return_all_non_empty_wells
    Created new method return_all_wells which returns every well in the plate
    method fill_well - Changed checking of $EVAL_ERROR from eq to m//
lib/Labware/Well.pm
    Added BUILD method which calls position method. Allows checking that
    supplied well is valid after object has been created.
    Removed documentation for method plate_name. There is no plate_name method.
lib/Labware/WellMethods.pm
    Changed number_of_rows and number_of_columns methods to remove unneccessary
    elsif clause.
t/plate.t
    Added a bunch of new tests. Mostly testing untested exceptions

t/well.t
    Added a bunch of new tests. Mostly testing untested exceptions
lib/Labware/Well.pm - Added method is_empty to check for empty wells.
dist.ini - Changed version number to 0.0.2
.gitignore - Added cover_db/*