Add support for python virtual envrionment (#52)

Python virtual environment makes it easier to isolate python
ennvironments. It ensures that user and system installed modules do not
conflict with one another. Shaving the yak.

.gitignore

@@ -69,3 +69,6 @@ _build/
 #ignore vim swp files
 *.swp
 *.swo
+
+# python virtual envrionment
+venv/

README.md

@@ -9,21 +9,25 @@ for testing purposes.
 1. Clone this repo
    `git clone https://github.com/mailsac/mailsac-examples.git`
 
-2. Install sphinx
-   `pip install Sphinx sphinx_rtd_theme sphinx-tabs`
-
-3. Change directories to the cloned repo
+2. Change directories to the cloned repo
    `cd mailsac-examples`
 
-4. Run build script
+3. Setup virtual environment (option but helps isolate python modules)
+   `python3 -m venv venv`
+   `source venv/bin/activate`
+
+4. Install sphinx
+   `pip3 install Sphinx sphinx_rtd_theme sphinx-tabs`
+
+5. Run build script
    `make html`
 
-5. Build results can be found in `_build/html/`
+6. Build results can be found in `_build/html/`
 
-6. Optional - run a server to view the html output.
+7. Optional - run a server to view the html output.
     `npm install http-server -g`
     `http-server _build/html`
 
-7. Alternatively the reStructuredText Visual Studio Code extension can be used for live previews
+8. Alternatively the reStructuredText Visual Studio Code extension can be used for live previews
 
 Copyright © 2019 by Forking Software LLC

conf.py

@@ -65,7 +65,7 @@
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
 # This pattern also affects html_static_path and html_extra_path .
-exclude_patterns = [u'_build', 'Thumbs.db', '.DS_Store']
+exclude_patterns = [u'_build', 'Thumbs.db', '.DS_Store', 'venv']
 
 # The name of the Pygments (syntax highlighting) style to use.
 pygments_style = 'sphinx'