Fixes to documentation on installation
Fixes to documentation on installation

* Use virtualenvwrapper
* Use the right command to compile the catalog

jadonk/debexpo,jonnylamb/debexpo,jonnylamb/debexpo,swvist/Debexpo,jonnylamb/debexpo,swvist/Debexpo,jadonk/debexpo,swvist/Debexpo,jadonk/debexpo