Correction to the instructions for installation of kivy «Using MacPorts with pip»

[Sergey Yanovets]

I’ve faced some problems trying to install kivy on my Mac OS using instructions on https://kivy.org/docs/installation/installation-osx.html. And now I have some experience that can be useful. 

I could not find some special contact for this type of problems on Contact Us page (https://kivy.org/docs/contact.html). That is why I write it here. 

My Mac OS X version is 10.11.4 El Capitan.

I tried to install kivy by instructions «Using MacPorts with pip» https://kivy.org/docs/installation/installation-osx.html

1. Install MacPorts. It’s OK.
   I’ve used the package for El Capitan:
   MacPorts-2.3.4-10.11-ElCapitan.pkg
2. Install and set Python 3.4 as the default. Here I had to use sudo.
   $sudo port install python34
   $sudo port select --set python python34
3. Install and set pip as the default. Here is wrong name pip-34. Right commands:
   $sudo port install py34-pip
   $sudo port select --set pip pip34 
4. Install the requirements using Macports. It’s OK except sudo:
   $sudo port install libsdl2 libsdl2_image libsdl2_ttf libsdl2_mixer
5. Install cython 0.23 and kivy using pip
   $pip install -I Cython==0.23 
6. Install cython 0.23 and kivy using pip. It’s OK. I tried only development version. 

I hope my notes will be helpful for someone.