Inform Travis of WTSI::DNAP::Utilities 0.3.0.

    Pre-install dependencies, rather than using Build installdeps.

    Refactored to depend on perl-dnap-utilities.

    Reorganised the Travis build file.
Move to WTSI::DNAP::Utilities 0.3.1 which satisfies Module::Build's
reliance on literal package versions.
Added Perl Critic tests.
Install Test::Perl::Critic
Merge pull request #6 from keithj/devel

Refactored to depend on perl-dnap-utilities