Removing unused file
Add a new part item to main page if logged in
OVerwriting save() method of Transaction model to perform an update of stock of the part on saving the transaction.

This is currently only working for new transactions. Updated ones will currently result in a wrong on_stock-value
Merge branch 'master' into feature/basic-i18n-support

Conflicts:
	partuniverse/templates/index.html
	partuniverse/templates/login.html