Merge pull request #43 from microsoft/master

Pulling changes from master

Dockerfile

@@ -8,7 +8,7 @@ WORKDIR /src/app
 COPY . .
 
 # Install app dependencies and build static files
-RUN mkdir _site && \
+RUN mkdir _site && mkdir .jekyll-cache && \
     jekyll build --future
 
 #
@@ -20,4 +20,4 @@ FROM nginx:1.15-alpine
 WORKDIR /usr/share/nginx/html
 COPY --from=build /src/app/_site .
 
-EXPOSE 80
+EXPOSE 80