CRM-14868 allow currency signs in other_amount

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* CRM-14868: '$' in amount_other causes error
  https://issues.civicrm.org/jira/browse/CRM-14868
CRM-14868 allow currency signs in other_amount

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* CRM-14868: '$' in amount_other causes error
  https://issues.civicrm.org/jira/browse/CRM-14868
CRM-14868 Formatting fix

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* CRM-14868: '$' in amount_other causes error
  https://issues.civicrm.org/jira/browse/CRM-14868
CRM-14868 Formatting fix

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* CRM-14868: '$' in amount_other causes error
  https://issues.civicrm.org/jira/browse/CRM-14868
Merge pull request #4274 from mrpaulc/CRM-14868

CRM-14868 - allow currency symbol in contribution amount_other