v0.0.45: Revert to portable shell scripts

The default shell scripts has been changed back to using /bin/sh.
The bashisms that prevented the script from working on some systems with
conservative /bin/sh has been fixed.

v0.0.44: Hook-based DNS challenge support. Bugfixes.

The FDB package now hides hidden files (files starting with '.'). This
increases the resiliency of the storage module in the face of files like
.DS_Store. Previously the creation of these files in the state directory
could result in fatal errors. More loading errors in storage are now
nonfatal.

More tests have been added. A distinction is now drawn between integration
and unit tests.

Hook-based DNS challenge support is now available.

v0.0.43: Limited key pinning support. Stateless challenge support.

An existing key can now be specified in a targetfile by specifying

  request:
    key:
      id: key-id

where key-id is the key ID of the key. If the key is not found
or this option is not specified, a new key will be generated as usual.

Support for stateless challenges has been added. This mainly requires
appropriate webserver configuration. A command has been added to easily
retrieve the account key thumbprint to enable easy configuration of
stateless challenges.

The 'finished' quickstart dialog is now always printed to stdio
rather than shown via a dialog. It requires no acknowledgement and
because it is printed to stdio, can remain in view after acmetool
has exited, and is thus more helpful to the user.

stdio prompts are now word wrapped to 70 characters.

v0.0.42

v0.0.42: Add support for Hitch

v0.0.41

v0.0.41: Fix bug where webroot paths configured via legacy means woul…

v0.0.40

v0.0.40: Fix bug in import-le command

v0.0.39: Add HTTP challenge hooks support

Fix 'webroot path unlikely' dialog to not appear when running
in batch mode or when the webroot path came from a response file.

Default hook scripts corrected to use bash by default.

Add support for state directory permissions customisation.

Updated example response file to add ECDSA configuration options.

v0.0.38

v0.0.38: Major storage system refactoring, ECDSA account key support

v0.0.37: Revocation support, refactoring, more tests

- Revocation support

- Refactor hooks system

- Refactor endpoint database

- More tests.

Note for packagers overriding built-in default paths: notify.DefaultHooksPath
has moved to hooks.DefaultPath.

v0.0.36

v0.0.36: Add quickstart key selection support (use --expert), enhance…