CRM-15072 - use contact reference for staff responsible group

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* CRM-15072: staff responsible and event contact fields should be contact reference fields not option groups
  https://issues.civicrm.org/jira/browse/CRM-15072
CRM-15030, fixed the display of custom data of type checkbox in views

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* CRM-15030: Custom fields in Views display incorrectly or not at all, depending on label
  https://issues.civicrm.org/jira/browse/CRM-15030
CRM-15074 - _civicrm_registerClassLoader() should store a relative path.
Merge pull request #154 from kurund/CRM-15030

CRM-15030, fixed the display of custom data of type checkbox in views
Merge remote-tracking branch 'upstream/7.x-4.4' into 7.x-4.4-7.x-master-2014-08-12-10-27-21
Merge pull request #153 from jmcclelland/staff-responsible-contact-reference

CRM-15072 - use contact reference for staff responsible group
Merge pull request #155 from wellebee/CRM-15074

CRM-15074 - _civicrm_registerClassLoader() should store a relative path.