*: move build scripts to use GO15VENDOREXPERIMENT

closes #328

.travis.yml

@@ -5,7 +5,6 @@ services:
 language: go
 
 go:
-  - 1.4.3
   - 1.5.3
   - 1.6
 

Dockerfile-builder

@@ -1,5 +1,5 @@
-FROM golang:1.4
+FROM golang:1.6
 
 RUN go get golang.org/x/tools/cmd/cover
 RUN go get golang.org/x/tools/cmd/vet
-RUN go get github.com/tools/godep
+RUN go get github.com/tools/godep

env

@@ -1,11 +1,14 @@
-export GOPATH=${PWD}/Godeps/_workspace
+GOVERSION=$( go version | grep -o 'go1\.[0-9]')
 
-rm -rf $GOPATH/src/github.com/coreos/dex
-mkdir -p $GOPATH/src/github.com/coreos/
+UNSUPPORTED=( "go1.0" "go1.1" "go1.2" "go1.3" "go1.4" )
 
-# Only attempt to link dex into godeps if it isn't already there
-[ -d $GOPATH/src/github.com/coreos/dex ] || ln -s ${PWD} $GOPATH/src/github.com/coreos/dex
+for V in "${UNSUPPORTED[@]}"; do
+    if [ "$V" = "$GOVERSION" ]; then
+        echo "dex requires go version 1.5+. Please update your go version."
+        exit 2
+    fi
+done
 
+export GO15VENDOREXPERIMENT=1
 export VERSION=$(./git-version)
-
 LD_FLAGS="-X main.version=${VERSION}"