Releases for Provision ACL support

Compatibility with Aegir 2.x

Minor release to fix permissions on private directories that are created before the ACL hooks are ran.

Quite significant bugfix to complete the previous "all the directory" ACL: do not stop applying ACLs on errors...

Major release. In this release, we change the API and the directories that are covered by the module.

* implement #1416056: give access to entire site directory (was: add support for .git)
* fix #1226714: Symlink handling - we do not follow symbolic links, now that we allow writing to the sites directory directly, since that would be a severe security vulnerability. If a module or extension needs to change files outside the directory, it can do so with its own extension, using the code as documented
* #1149276: Implement a basic hook_drush_command for help
* implement #1222772: API for easily setting common ACLs on files (was: Support CiviCRM)

Detailed list of API changes:

* switch to using an $options array instead of passing random flags for the publicly available functions
* clarify which functions are private and which are public
* clarify the way the module works and make it more useable by third party modules
* to do this, we renamed two functions (provisionacl_settings_acls() to provisionacl_files_acls() and provisionacl_directories_acls() to provisionacl_dirs_acls()), so you will get a compilation error unless you port your module, if you used the older functions. this is on purpose: since those functions were badly designed and not really useable, I believe that should be really rare occurences and is not worth keeping compatibility shims.
* allow users to change recursive mode on provisionacl_dirs_acls()

This feature adds compatibility with the plain "drush dl" command. It makes it so that ACLs are not broken when new packages are downloaded - it resets the "mask" which is broken when the final copy is made by drush.

It also includes some API changes. If your module used some of the functions here, it will need to be adapted before it can work with 1.5. See http://drupalcode.org/project/provisionacl.git/commitdiff/c14d65d for details

This simply follows Aegir development to fix ACLs on client directories (see #1115960: Moving a site between platforms causes confusion).

Now you can, as a regular user, just cd ~aegir/clients/admin/example.com to acess your site, regardless of the platform it's been migrated to.

Small featureful release to add flexibility to this module:

#1103316: give proper ACLs on site's directories (modules/libraries/themes/files/private)
#1103312: don't create ACLs on non-existent groups