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/lafriks/xormstore/Gopkg.toml

@@ -1,50 +0,0 @@
-
-# Gopkg.toml example
-#
-# Refer to https://github.com/golang/dep/blob/master/docs/Gopkg.toml.md
-# for detailed Gopkg.toml documentation.
-#
-# required = ["github.com/user/thing/cmd/thing"]
-# ignored = ["github.com/user/project/pkgX", "bitbucket.org/user/project/pkgA/pkgY"]
-#
-# [[constraint]]
-#   name = "github.com/user/project"
-#   version = "1.0.0"
-#
-# [[constraint]]
-#   name = "github.com/user/project2"
-#   branch = "dev"
-#   source = "github.com/myfork/project2"
-#
-# [[override]]
-#  name = "github.com/x/y"
-#  version = "2.4.0"
-
-
-[[constraint]]
-  name = "github.com/go-sql-driver/mysql"
-  version = "1.3.0"
-
-[[constraint]]
-  name = "github.com/go-xorm/xorm"
-  version = "0.6.4"
-
-[[constraint]]
-  name = "github.com/gorilla/context"
-  version = "1.1.0"
-
-[[constraint]]
-  name = "github.com/gorilla/securecookie"
-  version = "1.1.1"
-
-[[constraint]]
-  name = "github.com/gorilla/sessions"
-  version = "1.1.0"
-
-[[constraint]]
-  branch = "master"
-  name = "github.com/lib/pq"
-
-[[constraint]]
-  name = "github.com/mattn/go-sqlite3"
-  version = "1.6.0"