added stable and develop information
# python virtual environment
## How to setup the VirtualEnvironment for development on linux?
-Install the requirements available via pip
+Install stable version from pip
```
+mkvirtualenv tellurium
+(tellurium) pip install tellurium
+```
+
+Install latest development version, or feature branch
+```
+# clone repository
git clone https://github.com/sys-bio/tellurium
cd tellurium
+
+# make virtual environment
mkvirtualenv tellurium
(tellurium) pip install -r requirements.txt
-```
-Install tellurium in the virtualenv
-```
+# checkout branch
+(tellurium) git checkout master
+
+# install tellurium
(tellurium) pip install -e .
```
