add -include(...) instead of -include_lib(...)
add ram_backend
fix version name
add log/3, debug/2, info/2, warning/2, error/2 and fatal/2 to loggers
not ignore error logger reports
lgger:log() convert no lists variables in lists
add is_valid_log_code
fix bug
ensure all loggers have finished their works when the app is stopped
Merge pull request #3 from pvieytes/next

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