Product slug does not remove apostrophe

[michaelbromley]

Describe the bug
When creating a new product and typing the product name, the slug is automatically generated as a normalized version of the name. However, it does not remove apostrophes.

To Reproduce
Steps to reproduce the behavior:

1. Go to "create new product" page
2. Type "John's apples" into the name field
3. The slug will now contain "john's-apples" with a validation error

Expected behavior
Apostrophe should be stripped out.

On further testing, these are also not stipped an should be:

• .
• =

Environment (please complete the following information):

• @vendure/core version: 0.1.2-beta.12