Added primer_gc_clamp global argument
Merge branch 'devel' into david
v0.020

    Added option to set Primer3 config values by command line for:
        - melting temp
        - gc percentage
        - primer size
try to re-throw any primer3 run errors with PRIMER_ERROR output from log file
add new exception class for primer3 run fail
create hash of primer3 config defaults and use this to setup default values for attributes
make attributes lazy
Merge branch 'devel' into david
fixed failing test for find-gibson-oligos command, make a better fail to find primers test by using a region slice with just N characters
ignore complex regex perlcritic complaint
add test to Util::Primer3 to check for new error thrown if primer3 fails to run
add tests for setting up primer3 default parameters
Merge branch 'devel' of github.com:htgt/Design-Creation into devel
    Write new Primer3 config values into parameters file.
    Throw a more meaningful error when Primer3 dies.
    Can set Primer3 gc_clamp value.