Fix error printing when login command fails (#32)

Currently, when the login command fails, it looks like this -

```
> github nelson nelson.example.com
/ Post https://nelson.example.com/auth/github: dial tcp 10.10.10.10:443: connect: operation timed oSuccessfully logged in to nelson.example.com
```

This is confusing as the login actually failed yet it says "Successfully logged in", and it also truncates the error message.

This PR fixes that by ensuring all the errors are printed properly without the spinner interfering. It also honours the global timeout setting, and moves the error to the end of the return arg list as per Go convention.

There is a minor change in timeout behaviour too - previously, the login command would wait until the server times out. Now, it has a default timeout of 60 seconds, in line with all the other commands.

src/github.com/getnelson/nelson/login.go

@@ -18,7 +18,7 @@ package main
 
 import (
 	"encoding/json"
-	"fmt"
+
 	"github.com/parnurzeal/gorequest"
 )
 
@@ -36,9 +36,9 @@ type Session struct {
 
 func Login(client *gorequest.SuperAgent, githubToken string, nelsonHost string, disableTLS bool) []error {
 	baseURL := createEndpointURL(nelsonHost, !disableTLS)
-	e, sess := createSession(client, githubToken, baseURL)
-	if e != nil {
-		return []error{e}
+	sess, errs := createSession(client, githubToken, baseURL)
+	if errs != nil {
+		return errs
 	}
 	writeConfigFile(sess, baseURL, defaultConfigPath()) // TIM: side-effect, discarding errors seems wrong
 	return nil
@@ -56,7 +56,7 @@ func createEndpointURL(host string, useTLS bool) string {
 }
 
 /* TODO: any error handling here... would be nice */
-func createSession(client *gorequest.SuperAgent, githubToken string, baseURL string) (error, Session) {
+func createSession(client *gorequest.SuperAgent, githubToken string, baseURL string) (Session, []error) {
 	ver := CreateSessionRequest{AccessToken: githubToken}
 	url := baseURL + "/auth/github"
 	_, bytes, errs := client.
@@ -65,22 +65,17 @@ func createSession(client *gorequest.SuperAgent, githubToken string, baseURL str
 		Send(ver).
 		SetCurlCommand(globalEnableCurl).
 		SetDebug(globalEnableDebug).
+		Timeout(GetTimeout(globalTimeoutSeconds)).
 		EndBytes()
 
 	if len(errs) > 0 {
-		errStrs := make([]string, len(errs))
-		for i, e := range errs {
-			errStrs[i] = e.Error()
-			fmt.Print(e.Error())
-		}
-
-		return errs[0], Session{}
+		return Session{}, errs
 	}
 
 	var result Session
 	if err := json.Unmarshal(bytes, &result); err != nil {
-		return err, Session{}
+		return Session{}, []error{err}
 	}
 
-	return nil, result
+	return result, nil
 }

src/github.com/getnelson/nelson/main.go

@@ -123,8 +123,13 @@ func main() {
 				// fmt.Println("token: ", userGithubToken)
 				// fmt.Println("host: ", host)
 				pi.Start()
-				Login(http, userGithubToken, host, disableTLS)
+				errs := Login(http, userGithubToken, host, disableTLS)
 				pi.Stop()
+				if len(errs) != 0 {
+					PrintTerminalErrors(errs)
+					return cli.NewExitError("Login failed.", 1)
+				}
+
 				fmt.Println("Successfully logged in to " + host)
 				return nil
 			},