CRM-14142 - 'Last modified' in Views

Adds the 'last modified' date of a contact to the Views integration: as
a field and sortable filter.
Merge pull request #114 from JKingsnorth/CRM-14142

CRM-14142 - 'Last modified' in Views
Merge pull request #112 from eileenmcnaughton/7.x-4.4

CRM-14096 add check for civicrm-core dir in layout
fixes for CRM-12956, bug in calculating custom field id

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* CRM-12956: CiviCRM custom fields (with selects) in Views are a mess
  http://issues.civicrm.org/jira/browse/CRM-12956
Merge pull request #115 from kurund/CRM-12956

fixes for CRM-12956, bug in calculating custom field id
CRM-14186: drush cache clear: use the API to flush the code, and slip in a fix to delete the civicrm_class_loader drupal variable that can cause problems if the civicrm instance is moved around on a same server and classloader could get included twice.
merge
Use civicrm_api() instead of civicrm_api3()

since checking for is_error.
CRM-14251 views integration:event links - return empty instead of non-link
text where link is not permissioned
fix function getOperationPair - not static in parent class
Merge pull request #127 from eileenmcnaughton/patch-2

fix function getOperationPair - not static in parent class
CRM-14381 - Views - group custom data joins to wrong table (contact)
Merge branch '7.x-4.4' of https://github.com/civicrm/civicrm-drupal into 7.x-4.4
CRM-14437 CiviEngage walklist fixes
Merge pull request #118 from mlutfy/4.4-crm14186

CRM-14186: drush cache clear: use the API to flush the code, and slip…
Merge pull request #132 from eileenmcnaughton/patch-1

CRM-14381 - Views - group custom data joins to wrong table (contact)
CRM-14464 fix preferred communication method
Merge branch '7.x-4.4' of git://github.com/civicrm/civicrm-drupal into 7.x-4.4