added support for validating the password against a blacklist
[Blacklist] Added ArrayProvider
added tests for the blacklist validator and providers
[Blacklist] Added PdoProvider and updated SqliteProvider
updated README.md and simplified the configuration
fixed documentation
fixed RollerworksPasswordStrengthExtension and default blacklist.default_provider
[Blacklist] renamed write() to add() and truncated table-name
[Blacklist] added tests for SqliteProvider
[Blacklist] added commands for maintaining the blacklist database (SQLite only)
fixed CS
[Blacklist] added command for exporting the blacklist database
fixed DependencyInjection/Configuration.php string not a valid node-type and missing fixXmlConfig()
fixed DependencyInjection/RollerworksPasswordStrengthExtension.php unable to find definition
merged branch rollerworks/blacklist (PR #1)
This PR was merged into the master branch.

Discussion
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Added support for validating the password against a blacklist

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT