Fix missing sqlalchemy dependency

.travis.yml

@@ -3,8 +3,8 @@ python: "2.7"
 env:
     - DAV_SERVER=radicale RADICALE_STORAGE=filesystem
     - DAV_SERVER=radicale RADICALE_STORAGE=database
-    - DAV_SERVER=radicale-git RADICALE_STORAGE=filesystem
-    - DAV_SERVER=radicale-git RADICALE_STORAGE=database
+    - DAV_SERVER=radicale_git RADICALE_STORAGE=filesystem
+    - DAV_SERVER=radicale_git RADICALE_STORAGE=database
 
 install:
     - "sh install-deps.sh"

install-deps.sh

@@ -1,15 +1,19 @@
 pip install --use-mirrors .
 pip install --use-mirrors -r requirements.txt
 [[ -z "$DAV_SERVER" ]] && DAV_SERVER=radicale
-case "$DAV_SERVER" in
-    "radicale")
-        pip install --use-mirrors radicale
-        ;;
-    "radicale-git")
-        pip install git+https://github.com/Kozea/Radicale.git
-        ;;
-    *)
-        echo "$DAV_SERVER is not known."
-        exit 1
-        ;;
-esac
+
+radicale_deps() {
+    if [[ "$RADICALE_STORAGE" == "database" ]]; then
+        pip install --use-mirrors sqlalchemy
+    fi
+}
+
+davserver_radicale() {
+    pip install --use-mirrors radicale
+}
+
+davserver_radicale_git() {
+    pip install git+https://github.com/Kozea/Radicale.git
+}
+
+davserver_$DAV_SERVER