Improves updateSync: connect to paypal only once.
Merging with actual core and resolving conflicts.
Fixes ordering of products.
Show service cost only if its price is greater than 0.
Fixes paypalurl in frontend and summary order of items in paypal.
Merge pull request #205 from dahoffmann/master

Deletes \$_context and _getContext() in class because they already exist in extended abstract class and are not used in this class.
Using abstract tree ui and fixing bugs.
Adding translation.
Merge https://github.com/Arcavias/arcavias-core into 2013-05-29_Reducing_UpdateSync_In_PayPal
Fixes output in paypal overview and adds translation in paypalexpress
Merge pull request #199 from doleiynyk/2013-05-29_Reducing_UpdateSync_In_PayPal

Reduces requests in updateSync() for PayPal and improves output shown on PayPal
Separates delivery and payment service fees in single positions in the basket to match the output of the PayPal provider
Merge https://github.com/Arcavias/arcavias-core into common_summary
Updates translation files
Merge pull request #207 from nsendetzky/master

Separates delivery and payment service fees in single positions in the basket
Switches position of payment and delivery to match default order in checkout process
Links delivery/payment service costs in summaries of basket and checkout
Rewrites HTML client to work with content security policies (http://en.wikipedia.org/wiki/Content_Security_Policy)
Merge pull request #209 from nsendetzky/master

Links delivery/payment service costs in summaries, switches position of payment and delivery in summaries and  	rewrites HTML client for content security policies
Removes old references to JS files