Rl-plotter

**You can use seaborn kernel to get the same plot style as [OpenAI-spinningup](https://github.com/openai/spinningup) NOW !!!**
- multiple plotting kernels (native matplotlib plotting or seaborn plotting)
- support [OpenAI-spinningup](https://github.com/openai/spinningup) data format
- remove first line in origin log format
- logger got time output and debug mode
- you can track `locals()` in logger (it will save as config.json automatically)
- fix some bugs

- support OpenAI spinningup data style
- little change to logger file style and support the old style
- add time output for logger

- support multi y keys & duel y axis **(important!)**
- add some legend options

- add filter of directory name
- change default x-axis formatter

- adjust struct of custom logger
- adjust default log dir

- add CustomLogger
- adjust default log dir
- fix bugs