refactoring some containers

hhvm/Dockerfile

@@ -1,12 +1,13 @@
 FROM ubuntu:14.04  
 
-RUN apt-key adv --recv-keys --keyserver hkp://keyserver.ubuntu.com:80 0x5a16e7281be7a449 
-RUN apt-get update -y && apt-get install -y software-properties-common \
-   && add-apt-repository "deb http://dl.hhvm.com/ubuntu $(lsb_release -sc) main" \
-   && apt-get update -y \
-   && apt-get install -y hhvm \
-   && apt-get clean \
-   && rm -rf /var/lib/apt/lists/*
+RUN apt-key adv --recv-keys --keyserver hkp://keyserver.ubuntu.com:80 0x5a16e7281be7a449
+
+RUN apt-get install -y software-properties-common \
+    && add-apt-repository "deb http://dl.hhvm.com/ubuntu $(lsb_release -sc) main" \
+    && apt-get update -y \
+    && apt-get install -y hhvm \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
 
 RUN mkdir -p /var/www/laravel