remove deprecated ez_setup.py; update install instructions (fixes #91)

[brennen]

Removes ez_setup.py, adds pip / pip3 installation instructions to README.md. Bumps version to 1.3.4.

[juliogonzalez]

The instructions are missing python-pip/python3-pip (at least in my Raspbian python-dev/python3-dev does not have it as dependency).

However installing python-pip or python3-pip takes care of installing build-essentials, python-dev/python3-dev and all the rest of the stuff.

As the instructions are for microcomputers, I think it's best to save as much space as possible. And in the end, the less software the user has installed, smaller the risk of having vulnerabilities, so IMHO it's best to fully separate python2 and python3 instructions.

On the other hand, I am not really sure sudo python -m pip install --upgrade pip setuptools wheel is needed for everyone. At my raspbian it's not required to install using pip (but I am not removing from the proposal anyway).

So my proposal would be:

Installing

Dependencies

For all platforms (Raspberry Pi and Beaglebone Black) make sure your system is able to compile and download Python extensions with pip:

On Raspbian or Beaglebone Black's Debian/Ubuntu image you can ensure your system is ready by running one or two of the following sets of commands:

Python2:

sudo apt-get update
sudo apt-get install python-pip
sudo python -m pip install --upgrade pip setuptools wheel

Python3:

sudo apt-get update
sudo apt-get install python3-pip
sudo python3 -m pip install --upgrade pip setuptools wheel

Install with pip

Use pip to install from PyPI.

Python2:

sudo pip install Adafruit_DHT

Python3:

sudo pip3 install Adafruit_DHT

Compile and install from the repository

First download the library source code from the GitHub releases page, unzipping the archive, and execute:

Python2:

cd Adafruit_Python_DHT
sudo python setup.py install

Python3:

cd Adafruit_Python_DHT
sudo python3 setup.py install

You could also git clone the repository if you want to test an unreleased version.

[juliogonzalez]

I tested the instructions above, and everything seems to be working fine on Raspbian, even compiling locally from the remove_ez_setup branch.

[brennen]

Thanks for the quality feedback. I'll tweak instructions a bit and merge.

[juliogonzalez]

LGTM!

[brennen]

Thanks again. Merged, uploaded to both PyPI locations.