travis: use gopkg.in, go 1.8, go tip

Author: smola

.travis.yml

@@ -2,7 +2,17 @@ language: go
 sudo: false
 go:
   - 1.7
+  - 1.8
+  - tip
+matrix:
+  fast_finish: true
+  allow_failures:
+    - go: tip
 before_install:
+  - rm -rf $GOPATH/src/gopkg.in/sqle
+  - mkdir -p $GOPATH/src/gopkg.in/sqle
+  - ln -s $PWD $GOPATH/src/gopkg.in/sqle/gitql.v0
+  - cd $GOPATH/src/gopkg.in/sqle/gitql.v0
   - go get -t -v ./...
 install:
   - go build -ldflags="-X main.version=$TRAVIS_TAG" -v -o gitql ./cmd/...