Lovely-testlayers

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- added missing README to distro

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- allow to set a snapshot directory in workdirectory-layer - this
allows for generating non-temporary snapshots.

- moved wait implementation for server start in server-layer into
start, this is usefull when calling start and stop in tests, but
might introduce incompatibilities when subclassed.

- moved to github

- postgresql 8.4 compat

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- also dump routines for mysql

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- try to run commands from the scripts dir (mysql 5.5)

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- fixed the mysqld_path to work with newer mysql version

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- fixed an UnboundLocalError in server layer

- do not use shell option in server layer command and sanitize the
command options.

- reduced start/stop wait times in mysql layer

- use modification times in layer sql script change checking
additionally to the paths. this way the test dump is only used if
the sql scripts have not been modified since the last test run.

- stop sql servers when runscripts fails in layer setup because
otherwise the server still runs after the testrunner exited.

- allow to define a defaults file in mysql layer

- fixed cassandra layer download url

- removed dependency to ``zc.buildout`` which is now in an extra
called ``cassandra`` because it is only needed for downloading
cassandra.

- removed dependency to ``zope.testing``

- removed dependency to ``transaction``

- do not pipe stderr in base server layer to prevent overflow because
it never gets read