CRM-15589 - Membership section label mixup

https://issues.civicrm.org/jira/browse/CRM-15589
CRM-15546 - Fixed constants issue/bug in BaseIPN.php and PaymentProcessor.tpl

https://issues.civicrm.org/jira/browse/CRM-15546
Merge pull request #4621 from atif-shaikh/CRM-15589

CRM-15589 - Membership section label mixup
Cleanup phpdoc comments
Merge pull request #4635 from colemanw/comments

Cleanup phpdoc comments
Advanced Search does not filter relationships with deleted contacts Fix
Merge pull request #4630 from atif-shaikh/CRM-15546

CRM-15546 - Fixed constants issue/bug in BaseIPN.php and PaymentProcesso...
Merge pull request #4638 from jitendrapurohit/CRM-13456

Advanced Search does not filter relationships with deleted contacts
CRM-15674 - API rest code cleanup
Merge pull request #4642 from colemanw/CRM-15674

CRM-15674 - API rest code cleanup