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

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