Use a version of bundler compatible with Travis CI.
Use a version of bundler compatible with Travis CI.

thoughtbot/shoulda-matchers,taichiman/shoulda-matchers,stanchan/shoulda-matchers,cheshire-cat/shoulda-matchers,biow0lf/shoulda-matchers,guialbuk/shoulda-matchers,PikachuEXE/shoulda-matchers,stanchan/shoulda-matchers,reacuna/shoulda-matchers,alejandrogutierrez/shoulda-matchers,biow0lf/shoulda-matchers,guialbuk/shoulda-matchers,thewatts/shoulda-matchers,taichiman/shoulda-matchers,thewatts/shoulda-matchers,plribeiro3000/shoulda-matchers,maurogeorge/shoulda-matchers,raysrashmi/shoulda-matchers,timoschilling/shoulda-matchers,cheshire-cat/shoulda-matchers,alejandrogutierrez/shoulda-matchers,awmichel/shoulda-matchers,biow0lf/shoulda-matchers,cheshire-cat/shoulda-matchers,taichiman/shoulda-matchers,thewatts/shoulda-matchers,reacuna/shoulda-matchers,timoschilling/shoulda-matchers,thoughtbot/shoulda-matchers,plribeiro3000/shoulda-matchers,raysrashmi/shoulda-matchers,biow0lf/shoulda-matchers,awmichel/shoulda-matchers,stanchan/shoulda-matchers,thoughtbot/shoulda-matchers,NafaaBout/shoulda-matchers,timoschilling/shoulda-matchers,raysrashmi/shoulda-matchers,reacuna/shoulda-matchers,stanchan/shoulda-matchers,NafaaBout/shoulda-matchers,maurogeorge/shoulda-matchers,reacuna/shoulda-matchers,thoughtbot/shoulda-matchers,alejandrogutierrez/shoulda-matchers,alejandrogutierrez/shoulda-matchers,guialbuk/shoulda-matchers,AlexVPopov/shoulda-matchers,raysrashmi/shoulda-matchers,cheshire-cat/shoulda-matchers,thewatts/shoulda-matchers,timoschilling/shoulda-matchers,plribeiro3000/shoulda-matchers,awmichel/shoulda-matchers,AlexVPopov/shoulda-matchers,guialbuk/shoulda-matchers,AlexVPopov/shoulda-matchers,fxposter/shoulda-matchers,AlexVPopov/shoulda-matchers,plribeiro3000/shoulda-matchers,NafaaBout/shoulda-matchers,awmichel/shoulda-matchers,NafaaBout/shoulda-matchers,maurogeorge/shoulda-matchers,taichiman/shoulda-matchers