commerce_devel 7.x-1.0-beta6

Changes since 7.x-1.0-beta5:

• #2484805 by uladzimir.karol: Replace 'und' with the constant LANGUAGE_NONE for multi language site in commerce_devel
• Revising batch product generation and deletion to work together better.
• Updating product generation to watchdog elapsed time spent adding products
• Adding in functionality that revises product generation to loop through X products, versus call a function that generates one product X time in order to resolve memory leaks
• #2201827 by rahulbile: Fixed Strict Standards: Only variables should be passed by reference.
• #1715654 by mwisner, cvangysel: Added Order generation in commerce_devel_generate should also generate customer profiles.
• #1951944 by Haza: Fix products generation via drush.