CRM-13922 - Campaign - release respondents assigned to any interviewer

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* CRM-13922: release respondent search doesn't allow you to find contacts reserved to a different interviewer
  http://issues.civicrm.org/jira/browse/CRM-13922
CRM-13922 - Campaign - avoid undefined index error when releasing respondents

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* CRM-13922: release respondent search doesn't allow you to find contacts reserved to a different interviewer
  http://issues.civicrm.org/jira/browse/CRM-13922
fix typo
take into account the current_employer pseudo field
Allow Participant roles to be specified as an array
Merge pull request #2174 from jmcclelland/release-all-survey-respondents

Release all survey respondents
Merge pull request #2184 from eileenmcnaughton/typo

fix typo
Merge pull request #2188 from kirkatcaat/4.4

Participant BAO can accept role IDs in an array
Merge pull request #2187 from tttp/CRM-13949-current-employer

CRM-13949 take into account the current_employer pseudo field in api.contact.get
Merge branch '4.4' of git://github.com/civicrm/civicrm-core into CRM-13738
CRM-13738 related fix

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* CRM-13738: Activity Report fails if filtering on any contact
  http://issues.civicrm.org/jira/browse/CRM-13738