Fogledger

- Creating configuration classes
- Removal of configuration files

Corrections were made in the IotaBasic class, the configuration files and the initial snaphost will be saved in the linux /tmp folder.

New module with IOTA TANGLE integration.

What's Changed
* Merge dev by WesleiSantos in https://github.com/larsid/FogLedger/pull/2
* Dev by WesleiSantos in https://github.com/larsid/FogLedger/pull/4

New Contributors
* WesleiSantos made their first contribution in https://github.com/larsid/FogLedger/pull/2

**Full Changelog**: https://github.com/larsid/FogLedger/compare/v2.1.0...v3.0.0

Added interface to config_nodes