corrected a bug that prevents decimal dropdown and multiselect values from beeing added if a identical value without decimal value exists
Prevent error with rewgistering Singleton if EcomDev_UrlRewrite is not installed
Merge pull request #76 from nhp/images

allowed to have more than the standard 3 images assigned during import
Merge pull request #78 from aterjung/master

better dropdown/multiselect option creation
[+FEAT] Set the error limit on an import
[+FEAT] ignoreDuplicates implemented for customers
[+FEAT] Allow setting multiple stock_ids on a single product

Improved compability with multi warehouse module (InnoExts_Warehouse) but doesn't conflict if it isn't installed.
[~BUGFIX] Qty wasn't correctly set for other stock ids.
[+TASK] Added a security check for categories with invalid paths