Add basic Travis CI build file.

Tests builds for multiple platforms and Go versions.

Author: Diwaker Gupta

.travis.yml

@@ -0,0 +1,9 @@
+language: go
+
+go:
+  - 1.6.3
+  - 1.7
+
+before_script: go get -u github.com/mitchellh/gox
+
+script: gox -osarch="darwin/amd64 linux/amd64 windows/amd64" ./dropbox/...