2.4.1: Feature to show or hide file counts (#98)

[e86388f] Fix translation for 'refresh' (#97)
[a7ea91b] Add backward compatible config value for showing numbers in the tree view
[f66200d] Don't show number of files when configuration value is false
[55d55e2] Add documentation for the show_file_count config
[9a9de78] Merge branch 'feature-show-file-count' of https://github.com/Martin1982/FileManagerBundle into Martin1982-feature-show-file-count
[c3afaf2] Merge branch 'Martin1982-feature-show-file-count'