CRM-13655 - GenCode - Allow overriding COLLATE for specific columns

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* CRM-13655: WordReplacement - Uniqueness key should allow different cases and domains
  http://issues.civicrm.org/jira/browse/CRM-13655
CRM-13655 - WordReplacement.xml - Update UNIQUE key for new installations

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* CRM-13655: WordReplacement - Uniqueness key should allow different cases and domains
  http://issues.civicrm.org/jira/browse/CRM-13655
CRM-13655 - Upgrade/.../FourFour.php - Setup correct schema for civicrm_word_replacement (4.3.x => 4.4.1)

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* CRM-13655: WordReplacement - Uniqueness key should allow different cases and domains
  http://issues.civicrm.org/jira/browse/CRM-13655
CRM-13655 - Upgrade/.../FourFour.php - Setup correct schema for civicrm_word_replacement (4.4.0 => 4.4.1)

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* CRM-13655: WordReplacement - Uniqueness key should allow different cases and domains
  http://issues.civicrm.org/jira/browse/CRM-13655
Merge pull request #1859 from totten/4.4-wordrep-key

CRM-13655 - civicrm_word_replacement schema fixes