Disable parallel tests by default
Disable parallel tests by default

Run them in parallel only in the dev mode. Looks like that Travis CI
is really flaky with a parallel test execution. The build often fails
without a reason and this really confuses new contributors. Better
have a slow and stable build then fast and unreliable.

micsta/dropwizard,pkwarren/dropwizard,evnm/dropwizard,dotCipher/dropwizard,dropwizard/dropwizard,aaanders/dropwizard,nickbabcock/dropwizard,phambryan/dropwizard,Alexey1Gavrilov/dropwizard,ryankennedy/dropwizard,mosoft521/dropwizard,qinfchen/dropwizard,aaanders/dropwizard,evnm/dropwizard,qinfchen/dropwizard,tjcutajar/dropwizard,takecy/dropwizard,dropwizard/dropwizard,dotCipher/dropwizard,cvent/dropwizard,nickbabcock/dropwizard,mosoft521/dropwizard,nickbabcock/dropwizard,kjetilv/dropwizard,Alexey1Gavrilov/dropwizard,micsta/dropwizard,phambryan/dropwizard,pkwarren/dropwizard,taltmann/dropwizard,cvent/dropwizard,anonymint/dropwizard,kjetilv/dropwizard,takecy/dropwizard,patrox/dropwizard,ryankennedy/dropwizard,tjcutajar/dropwizard,taltmann/dropwizard,kjetilv/dropwizard,mosoft521/dropwizard,takecy/dropwizard,Alexey1Gavrilov/dropwizard,zhiqinghuang/dropwizard,shawnsmith/dropwizard,pkwarren/dropwizard,micsta/dropwizard,qinfchen/dropwizard,mattnelson/dropwizard,tburch/dropwizard,tjcutajar/dropwizard,zhiqinghuang/dropwizard,tburch/dropwizard,jplock/dropwizard,mattnelson/dropwizard,tburch/dropwizard,anonymint/dropwizard,patrox/dropwizard,phambryan/dropwizard,patrox/dropwizard,evnm/dropwizard,cvent/dropwizard,shawnsmith/dropwizard,mattnelson/dropwizard,taltmann/dropwizard,dotCipher/dropwizard,jplock/dropwizard,shawnsmith/dropwizard,aaanders/dropwizard,ryankennedy/dropwizard,jplock/dropwizard,zhiqinghuang/dropwizard,dropwizard/dropwizard