Check that versions given to db.version() is a positive number. Resolves #491
Check that versions given to db.version() is a positive number.
Resolves #491

dfahlander/Dexie.js,jimmywarting/Dexie.js,dfahlander/Dexie.js,jimmywarting/Dexie.js,dfahlander/Dexie.js,jimmywarting/Dexie.js,dfahlander/Dexie.js,jimmywarting/Dexie.js