fix weird issue where Rake/Rails incorrectly determines BUNDLE_PATH
fix weird issue where Rake/Rails incorrectly determines BUNDLE_PATH

This patch makes the hipster: namespace completely ignore that and
use whatever bundler it finds in $PATH. [skip-ci]

nnev/hipsterpizza,breunigs/hipsterpizza,breunigs/hipsterpizza,nnev/hipsterpizza,breunigs/hipsterpizza,breunigs/hipsterpizza,nnev/hipsterpizza,nnev/hipsterpizza