This reverts commit df2e410f.

Deprecated rake functions issue a warning and then call paver
replacements

Bring Paver commands up to date with master for servers, assets, and docs.
Revert deprecation of quality, tests, and i18n for a future pull request.
Deprecate workspace migration

Windows doesn't differentiate between files with/without executable bit,
so this can't be used to exclude the README file from the migrations to
be executed, when the sources are accessed from a Windows partition.

Rake by default imports all .rake files in the rakelib dir, so we can
use that rather than doing our own import loop.