cleaning up, some syntax fixed and edge cases considered

scripts/create-dev-env.sh

@@ -393,11 +393,12 @@ if [[ `type -t mkvirtualenv` != "function" ]]; then
         ;;
 
         squeeze|wheezy|jessie|maya|lisa|olivia|nadia|natty|oneiric|precise|quantal|raring)
-        if [[ -f "/etc/bash_completion.d/virtualenvwrapper"]]; then
+        if [[ -f "/etc/bash_completion.d/virtualenvwrapper" ]]; then
             source /etc/bash_completion.d/virtualenvwrapper
         else
             error "Could not find virtualenvwrapper"
             exit 1
+        fi
         ;;
     esac
 fi
@@ -424,7 +425,7 @@ fi
 NUMPY_VER="1.6.2"
 SCIPY_VER="0.10.1"
 
-if [[ ! -n $compile ]]; then
+if [[ -n $compile ]]; then
     output "Downloading numpy and scipy"
     curl -sL -o numpy.tar.gz http://downloads.sourceforge.net/project/numpy/NumPy/${NUMPY_VER}/numpy-${NUMPY_VER}.tar.gz
     curl -sL -o scipy.tar.gz http://downloads.sourceforge.net/project/scipy/scipy/${SCIPY_VER}/scipy-${SCIPY_VER}.tar.gz