Continue working on PR#25 (https://github.com/ysde/grafana-backup-tool/pull/25):
* move all python into src/
* delete boilerplate restore_SOMETHING.sh scripts
* update README.md
* add some things to .gitignore

1.Make it python2 and python3 compatible 2.Try to solve special character when saving dashboard, folder problem 3.Add more verbose log message

Folders are available since Grafana v.5.0.*. Create scripts to migrate
folders and dashboards (with folders id)

A 412 failure from grafana prevents passing a dashboard with a slug that
is already present (i.e. restoring from a backup) to createDashboard.py.
Handle this by always deleting dashboards with the same name from
grafana prior to POSTing the new dashboard.