Updated to add composer to the path

Author: thilanga

docker/Dockerfile

@@ -8,3 +8,5 @@ RUN apt-get update && \
 RUN curl -sS https://getcomposer.org/installer | php \
     && mv composer.phar /usr/local/bin/ \
     && ln -s /usr/local/bin/composer.phar /usr/local/bin/composer
+
+ENV PATH="~/.composer/vendor/bin:./vendor/bin:${PATH}"