add: improved installation instructions

add: executable name depending if python 2 or 3

doc/source/installation.rst

@@ -1,14 +1,51 @@
 Installation
 ============
 
-Using PIP
----------
+Dependencies
+------------
 
-The easiest way to install enteleteaor is from Pypi. To do this, only run:
+First you be sure you have installed this packages:
+
+Python 2 & 3
+++++++++++++
 
 .. code-block:: bash
 
-    # pip install enteletaor
+    # sudo apt-get install -y libzmq3 libzmq3-dev
+
+Python 3 only (recommended)
++++++++++++++++++++++++++++
+
+.. code-block:: bash
+
+    # sudo apt-get install -y python3-pip
+
+Python 2 only
++++++++++++++
+
+.. code-block:: bash
+
+    # sudo apt-get install -y python2.7-dev
+
+
+Installation from PIP (recommended)
+-----------------------------------
+
+The easiest way to install enteleteaor is from Pypi. To do this, only run:
+
+Python 2
+++++++++
+
+.. code-block:: bash
+
+    # python -m pip install enteletaor
+
+Python 3
+++++++++
+
+.. code-block:: bash
+
+    # python3 -m pip install enteletaor
 
 Then run enteleteaor writing:
 
@@ -16,8 +53,20 @@ Then run enteleteaor writing:
 
     # enteleteaor -h
 
-From source
------------
+or, in Python 3:
+
+.. code-block:: bash
+
+    # enteleteaor3 -h
+
+.. note::
+
+    Remember that, if you install enteleteaor in **Python 3** executable will be called **enteletaor3** -> ending in **3**.
+
+    If you install in **Python 2** executable will be **enteletaor**, without 3.
+
+Installation from source
+------------------------
 
 Also, you can download source code from github using git:
 
@@ -34,7 +83,7 @@ Next you need to install dependencies from ``requirements.txt``:
 
 .. note::
 
-   If you're not running enteleteaor in a virtualenv, probably you need tu be root to install requirements. So, you can use ``sudo`` command.
+   If you're not running enteleteaor in a virtualenv, probably you need to be root to install requirements. So, you can use ``sudo`` command.
 
 Finally you can run enteleteaor: