version must be valid css-class

[lc-thomasberger]

https://github.com/adaptlearning/adapt_framework/blob/master/src/core/js/device.js#L192

make sure that versions are added as a valid css-class (no . as delimiters) so that they can be used in css for styling.

E.g. Version-8.0 --> Version-8-0

[oliverfoster]

all the classes should be lowercase also

[lc-thomasberger]

this might break existing themes though @oliverfoster

[moloko]

done in ca59e7a