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/mrjones/oauth/pre-commit.sh

@@ -1,21 +0,0 @@
-#!/bin/bash
-# ln -s $PWD/pre-commit.sh .git/hooks/pre-commit
-go test *.go
-RESULT=$?
-if [[ $RESULT != 0 ]]; then
-    echo "REJECTING COMMIT (test failed with status: $RESULT)"
-    exit 1;
-fi
-
-go fmt *.go
-for e in $(ls examples); do 
-    go build examples/$e/*.go
-    RESULT=$?
-    if [[ $RESULT != 0 ]]; then
-        echo "REJECTING COMMIT (Examples failed to compile)"
-        exit $RESULT;
-    fi
-    go fmt examples/$e/*.go
-done
-
-exit 0