add travis skeleton based on zdns's

.travis.yml

@@ -0,0 +1,22 @@
+language: go
+go:
+- 1.7.4
+before_install:
+- go get github.com/zmap/zcertificate
+- go get github.com/zmap/zlint
+- go get github.com/zmap/zcrypto/x509
+- go get github.com/zmap/rc2
+- go get github.com/zmap/zgrab2
+- go get github.com/sirupsen/logrus
+- go get github.com/miekg/dns
+before_script:
+- mkdir -p $GOPATH/src/github.com/zmap
+- ln -s $TRAVIS_BUILD_DIR $GOPATH/src/github.com/zmap || true
+- cd zgrab2/cmd/zgrab2 && go build && cd ../../..
+script:
+- "./integration_tests.py"
+notifications:
+  email:
+  - dev@censys.io
+  slack:
+    secure: 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