add fontpatcher

Signed-off-by: Jess Frazelle <acidburn@google.com>

fontpatcher/Dockerfile

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+FROM debian:stretch
+MAINTAINER Jessie Frazelle <jess@linux.com>
+
+RUN apt-get update && apt-get install -y \
+	python-fontforge \
+	--no-install-recommends \
+	&& rm -rf /var/lib/apt/lists/*
+
+RUN buildDeps=' \
+				ca-certificates \
+                git \
+        ' \
+        set -x \
+        && apt-get update \
+        && apt-get install -y $buildDeps --no-install-recommends \
+        && git clone -b develop --depth 1 https://github.com/Lokaltog/vim-powerline.git /pwrline \
+		&& ( \
+        cd /pwrline \
+		&& mv fontpatcher/fontpatcher /usr/bin/ \
+		&& mv fontpatcher/PowerlineSymbols.sfd /usr/bin/ \
+		) \
+        && rm -rf /pwrline \
+        && echo "Build complete."
+
+ENTRYPOINT [ "fontpatcher" ]

fontpatcher/README.md

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+# fontpatcher
+
+How to use:
+
+1. Enter the directory where the font file lives you wish to patch.
+2. Run:
+
+        $ docker run --rm -it \
+            -v $(pwd):/workdir \
+            --workdir /workdir \
+            r.j3ss.co/fontpatcher myfontfile.otf
+
+3. You should have a `myfontfile-Powerline.otf` as an artifact.
+4. Copy the font file into ``~/.fonts`` (or another X font directory)::
+
+       $ cp MyFontFile-Powerline.otf ~/.fonts
+
+   **Note:** If the font is a pure bitmap font (e.g. a PCF font) it will be
+   stored in the BDF format. This is usually not a problem, and you may
+   convert the font back to the PCF format using ``bdftopcf`` if you want
+   to. All other fonts will be stored in the OTF format regardless of the
+   original format.
+
+5. Update your font cache::
+
+       $ sudo fc-cache -vf
+
+   **Note:** If you use vim in rxvt-unicode in the client/daemon mode, you
+   may need to close all running terminals as well for the font to be
+   updated.