handle "permission denied" errors when command is run with insufficient
user rights
added missing new-line character
use more distinctive colors for error messages
add new-line after "file does not exist" message
remove superflous new-line and white-space from success message
Merge pull request #3 from Jalle19/cosmetics

Cosmetics
Add FlushCommand.php
Add support for maintenance mode
Merge pull request #2 from Jalle19/error-handling

Handle "permission denied" errors when command is run with insufficient user rights (fixes #1)