Merge branch 'installation-fix' into 'master'

Now stops installation if an existing component is found.

The expected behaviour is for people to uninstall the components/data before reinstalling Better.

See merge request !2

install

@@ -274,9 +274,9 @@ install(){
 	humanName=$2
 
 	# Check if a Better Builder installation exists.
-	if [ -d componentToInstall ]; then
-		echo "  • Existing ${humanName} found. Skipping installation."
-		return 0
+	if [ -d $componentToInstall ]; then
+		echo "\n  • Error: Existing ${humanName} found.\n\nPlease remove this if you want to reinstall it. You can uninstall existing Better components and data using the ./uninstall script.\n\nExiting.\n"
+		exit 1
 	fi
 
 	echo "\n  • Cloning ${humanName}…"