More Go versions in Travis; fix -cover

.travis.yml

@@ -1,11 +1,26 @@
 language: go
-go:
-    - 1.2
-    - 1.3
-    - tip
-install:
-    - go list -f '{{range .Imports}}{{.}} {{end}}' ./... | xargs go get -v
-    - go list -f '{{range .TestImports}}{{.}} {{end}}' ./... | xargs go get -v
-    - go build -v ./...
+
+matrix:
+  include:
+    - go: 1.2
+      install:
+      - go get code.google.com/p/go.tools/cmd/cover
+      - go list -f '{{range .Imports}}{{.}} {{end}}' ./... | xargs go get -v
+      - go list -f '{{range .TestImports}}{{.}} {{end}}' ./... | xargs go get -v
+    - go: 1.3
+      install:
+      - go get code.google.com/p/go.tools/cmd/cover
+      - go list -f '{{range .Imports}}{{.}} {{end}}' ./... | xargs go get -v
+      - go list -f '{{range .TestImports}}{{.}} {{end}}' ./... | xargs go get -v
+    - go: 1.4
+      install:
+      - go get golang.org/x/tools/cmd/cover
+      - go list -f '{{range .Imports}}{{.}} {{end}}' ./... | xargs go get -v
+      - go list -f '{{range .TestImports}}{{.}} {{end}}' ./... | xargs go get -v
+    - go: tip
+      install:
+      - go get golang.org/x/tools/cmd/cover
+      - go list -f '{{range .Imports}}{{.}} {{end}}' ./... | xargs go get -v
+      - go list -f '{{range .TestImports}}{{.}} {{end}}' ./... | xargs go get -v
 script:
-    - go test -v ./...
+  - go test -v ./... -cover