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The problem that can occur is ocassionally mvnw will not be executable. This can happen if mvnw is included from an archetype, as unix permissions aren't preserved within the jar they're stored in. Only using mvnw if it exists AND is executable

Add README.md to Symfony2 plugin

Bug introduced in cea941ce

* nanoc: update command aliases

- remove deprecated commands
- update `create-site`
- add `prune`

* nanoc: update README

* nanoc: update autompletion

- update commands
- add flag options to subcommands

* Added a README file for the systemadmin plugin

* Updated formatting of Functions table and split it into
"named" and "unnamed" functions for clarity

* Fixed issue with '|' characters in table by adding them in
<code> stateuents </code>

* Added \ escape characters in front of | characters

* Added README file to the dirpersist plugin

added additional details on how the plugin works.