use create_date and modified_date instead of civicrm_log table CRM-12753

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* CRM-12753: Searching for contacts by date created
  http://issues.civicrm.org/jira/browse/CRM-12753
use inner join and fixed label, CRM-12753

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* CRM-12753: Searching for contacts by date created
  http://issues.civicrm.org/jira/browse/CRM-12753
added js to change label, CRM-12753

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* CRM-12753: Searching for contacts by date created
  http://issues.civicrm.org/jira/browse/CRM-12753
CRM-12753, change labels according to selected options

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* CRM-12753: Searching for contacts by date created
  http://issues.civicrm.org/jira/browse/CRM-12753
CRM-14037 fix -  Class 'CRM_Activity_BAO_Contact' not found	Activity.php	/civicrm/CRM/Activity/BAO	line 2366	DLTK Problem

http://issues.civicrm.org/jira/browse/CRM-14037
CRM-14036_fix
Merge pull request #2263 from kurund/CRM-12753

CRM-12753, advanced search, change log fixes
Merge pull request #2302 from monishdeb/CRM-14037

CRM-14037 fix -  Class 'CRM_Activity_BAO_Contact' not found /civicrm/CRM/Activity/BAO/Activity.php DLTK Problem
Merge pull request #2294 from pratik-joshi/CRM-14036_fix

CRM-14036_fix
CRM-13926 new changess