[TASK] Changed creation of Finder objects. Removed creation with "new".

[skip ci]
[BUGFIX] Fixed issue #197 - Doesn't run when /tmp/magento/var exists and database is not created / tables missing
[BUGFIX] Fixed issue #197 - Doesn't run when /tmp/magento/var exists and database is not created / tables missing
[BUGFIX] Fixed issue #197 - Doesn't run when /tmp/magento/var exists and database is not created / tables missing

Catched error if i.e. database not correct defined.
[TASK] Changed tests (broken in older Magento Versions).
Updated readme.
[TASK] Bumped version

[skip ci]
added missing option processUncoveredFilesFromWhitelist
[FEATURE] Added --data-to-csv option to db:dump command