multi arch docker support

fixed #123

replace api version check with specific feature checks

This is important when mounting user volumes onto the container, so that
the generated output will be owned by the appropriate user id..

* ensure compat with hide_version Grafana setting

changed restore_functions to ordered dict

* save dashboard using uid rather than dashboard name

* bump version
* update CHANGELOG

add configuration attribute to set backup file name

remove useless cleanup metod within tempfile

Update for issue https://github.com/ysde/grafana-backup-tool/issues/106

added python2 support to restore functions

[Feature] add AWS_ENDPOINT_URL config option

add option backup_file_format in config

Update README.md

richer documentation details

fix issue of https://github.com/ysde/grafana-backup-tool/issues/96

Optional pretty print

This can make it easier to see changes when the backups are compared within version control.

Note, this changes to always pretty-print the JSON.  You might prefer that it's a configurable option.

basic auth should not override bearer auth

fix save.py component name typo

fix typo

- #83 Fix tarfile options for python2
- #64 Remove empty folders when backup file (.tar.gz) created.