New feature:
The control panel now displays the change in the crypto values to its previous state and indicates this graphically as well as numerically.
(By no means is this to become a real-time dashboard to display crypto currency values. The delta is only calculated to the previous cached state in the indexDB)

- added coloring for the found and converted DOM elements on amazon domains
- minor style adjustments to control panel

- fixed versioning

- made more cryptocurrencies (other than iota) available
- small fixes to control panel
- automatic conversion on more european amazon domains (.nl, .fr, .it, .es)
- updated documentation

Added a control panel. It includes a converter for manual conversion from EUR to IOTA, as well as a list of available crytocurrencies to select. Right now, only IOTA is supported.
This control panel is very rudimentary, new functionality will be added in the future.