Lovely-testlayers

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- raising a proper exception if mysqld was not found (fixes 3)

- moved dependency for 'transaction' to extras[pgsql] (fixes 2)

- fixed wrong path for dump databases in layer. (fixes 1)

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- the postgres and mysql client libs are now only defined as extra
dependencies, so installation of this package is also possible
without having those libs available

- added nginx layer see nginx.txt

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- added coverage

- added MySQLDatabaseLayer

- added mysql server

- added PGDatabaseLayer

- added pgsql server

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- initial release