add info about dev version in customization service

[kepper]

At the customization service, a list with details about the available MEI versions is given at the bottom. It is great that we now have access to the current dev version of MEI, but it should also have details about the latest commit of the dev version.

Here's the chain of where this info needs to come from:

• L101: version of customizationVersions
• L257: this.$store.getters.customizationVersions
• L260: state.customizationVersions
• L28: default values

It seems that fetchCustomizations() isn't working properly yet. We may have discussed this recently, but as I ran into it just now again, I wanted to keep a note somewhere ;-)

[kepper]

this has rather low priority, as it adds no functionality needed for running the service

[anneferger]

This would be fixed with Edirom/MEIGarage#35, but the change in the GUI needs to be done to actually get this information from the webservice, not the info stored in the GUI