Esapy

Fixed
- Suppress meaningless error message during uploading a md file

Fixed
- Calling `esa reset` to set post_number in an ipynb file which has not been uploaded didn't work.

Addded
- line/cell magic `esapy_fold` for code folding

Removed
- check if a cell is a matplotlib cell by the first line -> magic command

Fixed
- gathering post info by esa.io api before patch the post
- ignore message used in previous patch

Changed
- sustain hashdict by esa-reset (default)

Added
- record esapy version in metadata
- if this module is git repo, record revision also.
- `esa reset`
- `--clear-hashdict` option
- `--number` option

Fixed
- Scrolling has been enabled.
- Single line output (proper close tag).

Added
- subcommand: `ls`
- subcommand: `reset`