Remove redundant lines from .travis.yml
Remove redundant lines from .travis.yml

Several additional settings were introduced to work around Travis bug
8978, but that has since been resolved.

Additionally, also remove a fully redundant `script` line.

reinteractive/active_merchant,HealthWave/active_merchant,appfolio/active_merchant,customerlobby/active_merchant,miyazawadegica/active_merchant,atxwebs/active_merchant,activemerchant/active_merchant,whitby3001/active_merchant,taf2/active_merchant,planetargon/active_merchant,elevation/active_merchant,davidsantoso/active_merchant,Shopify/active_merchant,vanboom/active_merchant,BaseCampOps/active_merchant,buttercloud/active_merchant,Simplero/active_merchant,pinpayments/active_merchant,lcn-com-dev/active_merchant,vampirechicken/active_merchant,QuickPay/active_merchant,curiousepic/active_merchant,varyonic/active_merchant