windows install setup and warnings

[petrus-v]

While installation on windows is not tested we can't warranty it works perfectly. However in the latest pyconfr we have proved that section II works perfectly on windows.

we have to alert or find out a way to let use the makefile or maintain shell file or let the user read the makefile !

• to activate virtualenv there is a Script directory to activate (source does not exits)
  ./rooms-venv/Script/activate.bat

• in the make file to setup variable while launching unit test we did it in 2 lines:

SET ANYBLOK_CONFIG_FILE=app.test.cfg 
py.test -v -s rooms_booking