fix "marshal data too short" error when running bundle install

When running "bundle install" for the first time bundler crashed and displayed this error "marshal data too short".  I found a bundler issue that referenced the error and recommended changing the ruby gems url from http to https (https://github.com/bundler/bundler/issues/2015).  Once the initial install is done it did not matter if the url was http or https.  But I was able to reproduce by creating a new gemset with rvm and running "bundle install" again.