CRM-13460 - Add is_numeric checks and test coverage

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* CRM-13460: Make the numeric rule checks stricter
  http://issues.civicrm.org/jira/browse/CRM-13460
CRM-13460 - Add is_numeric checks and test coverage

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* CRM-13460: Make the numeric rule checks stricter
  http://issues.civicrm.org/jira/browse/CRM-13460
CRM-13460 - Add is_numeric checks and test coverage

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* CRM-13460: Make the numeric rule checks stricter
  http://issues.civicrm.org/jira/browse/CRM-13460
CRM-13355 - add support to retrieve non-public events

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* CRM-13355: CiviDiscount Codes Should Be Available on Non-Public Events
  http://issues.civicrm.org/jira/browse/CRM-13355
Merge pull request #1716 from dlobo/CRM-13355

CRM-13355 - add support to allow retrieval of non-public events also
fixes for CRM-13476

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* CRM-13476: In IE8, accordion controls do not work for Advanced Search form
  http://issues.civicrm.org/jira/browse/CRM-13476
Merge pull request #1720 from kurund/CRM-13476

CRM-13476, IE 8 related fixes for advance search
Merge branch 'CRM-13460' of git://github.com/dlobo/civicrm-core into pull-request-1708
CRM-13460 - CRM_Utils_RuleTest - Remove dead code

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* CRM-13460: Make the numeric rule checks stricter
  http://issues.civicrm.org/jira/browse/CRM-13460