Use a more restrictive gemfile for the coverage test run
Use a more restrictive gemfile for the coverage test run

For some reason, on Travis, installing the bundle for the generic
gemfile takes more than 20 minutes to resolve the dependencies.

danimashu/figaro,fny/figaro,cantonyselim/figaro,laserlemon/figaro,mumer92/figaro,z2s8/figaro,Mario245/figaro,NYULibraries/figs,7091lapS/figaro,vgvinay2/figaro