CRM-13968, handled In-progress to Completed contribution status change

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* CRM-13968: Contributions with "In Progress" status can't be edited and saved
  http://issues.civicrm.org/jira/browse/CRM-13968
-- CRM-13968, Added code to handle transaction for In progress contribution status

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* CRM-13968: Contributions with "In Progress" status can't be edited and saved
  http://issues.civicrm.org/jira/browse/CRM-13968
-- CRM-13968, added upgrade code to handle errorneous data with incorrect values
for to_financial_account_id and status_id

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* CRM-13968: Contributions with "In Progress" status can't be edited and saved
  http://issues.civicrm.org/jira/browse/CRM-13968
Merge pull request #2446 from pradpnayak/CRM-13968

Crm 13968