Migrate to dep (#3972)

* Update makefile to use dep

* Migrate to dep

* Fix some deps

* Try to find a better version for golang.org/x/net

* Try to find a better version for golang.org/x/oauth2

vendor/github.com/Unknwon/cae/README.md

@@ -1,37 +0,0 @@
-Compression and Archive Extensions
-==================================
-
-[![Go Walker](http://gowalker.org/api/v1/badge)](http://gowalker.org/github.com/Unknwon/cae)
-
-[中文文档](README_ZH.md)
-
-Package cae implements PHP-like Compression and Archive Extensions.
-
-But this package has some modifications depends on Go-style.
-
-Reference: [PHP:Compression and Archive Extensions](http://www.php.net/manual/en/refs.compression.php).
-
-Code Convention: based on [Go Code Convention](https://github.com/Unknwon/go-code-convention).
-
-### Implementations
-
-Package `zip`([Go Walker](http://gowalker.org/github.com/Unknwon/cae/zip)) and `tz`([Go Walker](http://gowalker.org/github.com/Unknwon/cae/tz)) both enable you to transparently read or write ZIP/TAR.GZ compressed archives and the files inside them.
-
-- Features:
-	- Add file or directory from everywhere to archive, no one-to-one limitation.
-	- Extract part of entries, not all at once. 
-	- Stream data directly into `io.Writer` without any file system storage.
-
-### Test cases and Coverage
-
-All subpackages use [GoConvey](http://goconvey.co/) to write test cases, and coverage is more than 80 percent.
-
-### Use cases
-
-- [Gogs](https://github.com/gogits/gogs): self hosted Git service in the Go Programming Language.
-- [GoBlog](https://github.com/fuxiaohei/GoBlog): personal blogging application.
-- [GoBuild](https://github.com/shxsun/gobuild/): online Go cross-platform compilation and download service.
-
-## License
-
-This project is under Apache v2 License. See the [LICENSE](LICENSE) file for the full license text.