Merge release 3.2 into master (#3548)

* Bumping version to: 3.2.0-rc1

* PLT-2863 fixing bad merge that broke this PR (#3523)

* PLT-2863 adding remove user from team

* PLT-2863 adding the client side UI

* Fixing trailing space

* Fixing reported issues

* Adding documentatino

* Switching to final javascript driver

* Fixing bad merge

* Fixing bad merge

* PLT-3538 Fix Login page doesn't show SAML option if gitlab is enabled (#3524)

* Login error messages fix (#3525)

* daily translations 20160708 (#3533)

* Fixed permissions when getting a file attachment to use the correct user id (#3535)

* PLT-3575 Fix Cannot upload certificates with .cer file extension on SAML (#3534)

* PLT-3560 blocking adding to channel once user is removed (#3537)

* Always allow system admins to see the Integrations sidebar (#3536)

* Plt 3475 - Post control improvements (#3538)

* Adding class to post when dropdown is active.

* plt-3475 - Post controls improvements

* daily translations 20160711 (#3544)

api/channel_test.go

@@ -833,6 +833,25 @@ func TestJoinChannelByName(t *testing.T) {
 	}
 }
 
+func TestJoinChannelByNameDisabledUser(t *testing.T) {
+	th := Setup().InitBasic()
+	Client := th.BasicClient
+	team := th.BasicTeam
+
+	channel1 := &model.Channel{DisplayName: "A Test API Name", Name: "a" + model.NewId() + "a", Type: model.CHANNEL_OPEN, TeamId: team.Id}
+	channel1 = Client.Must(Client.CreateChannel(channel1)).Data.(*model.Channel)
+
+	Client.Must(th.BasicClient.RemoveUserFromTeam(th.BasicTeam.Id, th.BasicUser.Id))
+
+	if _, err := AddUserToChannel(th.BasicUser, channel1); err == nil {
+		t.Fatal("shoudn't be able to join channel")
+	} else {
+		if err.Id != "api.channel.add_user.to.channel.failed.deleted.app_error" {
+			t.Fatal("wrong error")
+		}
+	}
+}
+
 func TestLeaveChannel(t *testing.T) {
 	th := Setup().InitBasic()
 	Client := th.BasicClient