In 667318116acda97b58734ae7512789a0f56db306, README.md’s file mode bits
were changed from 0o644 to 0o755. This commit reverts them back to
0o644.

Added a handy message to make it clear that compiling on a 64 bit OS is causing issues. After spending over an hour of troubleshooting think it should be made clearer as it'll affect quite a few users.

Note that quotes are needed, see bug #288.

build script is build.sh

STAGE_LIST can be specified in the config file to run additional build stages.

A config file can be specified when running build, e.g.:

  ./build.sh myconfig

Add ENABLE_SSH option

Add WPA_ESSID, WPA_PASSWORD and WPA_COUNTRY options to config.

Add FIRST_USER_NAME and FIRST_USER_PASS variables that can be set
in the config (or enviroment). Defaults to the standard pi and
raspberry.

Change Stage specification guide from removing `EXPORT*` files to adding `SKIP_IMAGES` as per new recommended development process.

Fixes #105

Closes #90

* Rename License.md to LICENSE

* Correct typos

* Clean up code layout

Organize layout with extra lines

Addresses #62

Because of the use of volumes the .img files (and everything else) will stay around on disk even when you do `docker rm pigen_work`. Passing `-v` deletes the volume as well and frees up disk space.

The previous example failed for me due to a missing SKIP in
stage5. While at it, complete the example with all steps needed to get
an image generated.

Added some documentation of environment variables to README.md,
specifically WORK_DIR and DEPLOY_DIR.  Explicitly did not include
SCRIPT_DIR at this time because that appears to require some small work
before it can be changed.

Took the chance for some other syntax cleanups while I was at it, mostly
breaking long lines and inserting whitespace where some Markdown parsers
require it.

* Added Docker support

- replaced necessity for devicemapper (through kpartx) by using parted and
  losetup with offsets
- added Dockerfile
- added dependency for parted and grep
- added hints to README.md
- common: loop through unmounts, fix shellcheck warnings

* stage2: use debconf instead of console-setup patch. Fixes #41

The additional space between the # at the beginning of a section and
title conforms to correct markdown spec (and works in all markdown
renderers, as opposed to just GitHub)