Factored out PayPal to lfs-paypal.

PayPal integration uses the default plugin mechanism now.
Improved shipping method management: display form errors; using ajax; issue #151.
Improved payment method management: display form errors; using ajax; issue #151.
Removed mceAddControl for tinymce which caused an error message on the javascript console; issue hg #10
Updated "Creating a Development Environment" concerning move to github.
More updates to the docs concerning move to github.
fixed form_klass default for SEOView
fixed form_klass assignment
Updated docs.

Updated installation instruction for development environment.

Updated installation instruction for development environment.

Added trouble shooting.

Updated locale within getting started.

Updated locale within getting started.
Added support for Celery.
Fixed wrong parameter to .
fixed datepicker handling for stock etc.
Use locale within to calculate packing.
Removed call to already removed deprecated method ``lfs.catalog.utils.calculate_real_amount``."
Fixed display of for sale price for variants within wthin product detail view."
Fixed calculation of discount price.
Fix for variant products: Changed property values were not saved.
Fix: Don't convert images with mode RGBA to RGB. That results in loss of alpha channel (transparency)
Fixed calculation and display of packings.
Updated es_MX translations