Removed /var/cache/nginx volume from the base image.

This creates more issues than solves real problems.

Closes nginx#19, closes nginx#40.

Author: thresheek

Dockerfile

@@ -14,8 +14,6 @@ RUN apt-key adv --keyserver hkp://pgp.mit.edu:80 --recv-keys 573BFD6B3D8FBC64107
 RUN ln -sf /dev/stdout /var/log/nginx/access.log \
 	&& ln -sf /dev/stderr /var/log/nginx/error.log
 
-VOLUME ["/var/cache/nginx"]
-
 EXPOSE 80 443
 
 CMD ["nginx", "-g", "daemon off;"]