Merge pull request #73 from arschles/vendor-env

fix(Makefile): set GO15VENDOREXPERIMENT in the build container

Author: arschles

Makefile

@@ -7,7 +7,7 @@ export GO15VENDOREXPERIMENT=1
 REPO_PATH := github.com/deis/${SHORT_NAME}
 DEV_ENV_IMAGE := quay.io/deis/go-dev:0.3.0
 DEV_ENV_WORK_DIR := /go/src/${REPO_PATH}
-DEV_ENV_PREFIX := docker run --rm -v ${CURDIR}:${DEV_ENV_WORK_DIR} -w ${DEV_ENV_WORK_DIR}
+DEV_ENV_PREFIX := docker run --rm -e GO15VENDOREXPERIMENT=1 -v ${CURDIR}:${DEV_ENV_WORK_DIR} -w ${DEV_ENV_WORK_DIR}
 DEV_ENV_CMD := ${DEV_ENV_PREFIX} ${DEV_ENV_IMAGE}
 
 # SemVer with build information is defined in the SemVer 2 spec, but Docker