rename rotate-log to log-rotate and purge-logs to log-purge to be more coherent with the naming convention of symfony tasks
rename rotate-log to log-rotate and purge-logs to log-purge to be more coherent with the naming convention of symfony tasks

git-svn-id: 2f0e1b834f829f9d45d4005679b0d62d953a4cdf@2842 4396de85-42e0-4213-a939-0f47b466bcdf

morhekil/symfony,morhekil/symfony,morhekil/symfony