Let travis only build master.
Update deps and migrate changes
Update missing documentation
Add table of contents
Document updater components
Bump version to 0.4.0
Add some doc for the InventoryUpdater.
Add initial vairant image sync. #2

Add TODOs for reference syncing (#4 and #5)
Add TODOs to fix additions/deletions of prices #1
Support deletion and additions of variant images. (#2)

Adjust spec for prices handling (#1).
Fixes #3 by adjusting regex to match any diget not only of lenght 1.
Introduce convenient method to handle masterVariant and variants in one call.
Ensure we remove all images before adding new once. #2
Move out isEnum check.
Add spec for price actions. #1
Support deletion and addition of variants. Close #1.
Implement tax category reference sync. Closes #4.
Implement sync of category references on products. Closes #5.
Fix call of actionsMapReference.
Get more info in case of spec error.
Use else if.