docker, previews, tor, bugfixes

* implemented docker
* added previews (markdown, html, text, video, audio)
* added tor support
* several bugfixes

Dockerfile

@@ -0,0 +1,18 @@
+FROM golang
+MAINTAINER Remco Verhoef <remco@dutchcoders.io>
+
+RUN mkdir -p /go/src/app
+WORKDIR /go/src/app
+
+# Copy the local package files to the container's workspace.
+ADD ./transfersh-server /go/src/app
+
+# install dependencies
+RUN go get ./
+
+# build & install server
+RUN go install . 
+
+ENTRYPOINT /go/bin/app --port 8080  
+
+EXPOSE 8080