Add sendmail to docker container (#772)

Dockerfile

@@ -3,11 +3,13 @@ MAINTAINER jekkos
 RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
     php5-apcu \
     libicu-dev \
-    libgd-dev
+    libgd-dev \
+    sendmail
 
 RUN a2enmod rewrite
 RUN docker-php-ext-install mysql mysqli bcmath intl gd sockets mbstring
 RUN echo "date.timezone = \"\${PHP_TIMEZONE}\"" > /usr/local/etc/php/conf.d/timezone.ini
+RUN echo -e “$(hostname -i)\t$(hostname) $(hostname).localhost” >> /etc/hosts
 
 WORKDIR /app
 COPY . /app