Create parent for parser classes CRM-11254

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* CRM-11254: Create parent class for import
  http://issues.civicrm.org/jira/browse/CRM-11254
Update calls to class constants CRM-11254

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* CRM-11254: Create parent class for import
  http://issues.civicrm.org/jira/browse/CRM-11254
Move redundant parser code into parent CRM-11254

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* CRM-11254: Create parent class for import
  http://issues.civicrm.org/jira/browse/CRM-11254
Create parent for Import/Form/Summary CRM-11254

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* CRM-11254: Create parent class for import
  http://issues.civicrm.org/jira/browse/CRM-11254
Merge stateMachine into one file CRM-11254

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* CRM-11254: Create parent class for import
  http://issues.civicrm.org/jira/browse/CRM-11254
Standardize on name DataSource instead of UploadFile CRM-11254

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* CRM-11254: Create parent class for import
  http://issues.civicrm.org/jira/browse/CRM-11254
Create parent for Import/Form/Preview CRM-11254

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* CRM-11254: Create parent class for import
  http://issues.civicrm.org/jira/browse/CRM-11254
Create parent for Import/Form/MapField CRM-11254

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* CRM-11254: Create parent class for import
  http://issues.civicrm.org/jira/browse/CRM-11254
-- fixed for CRM-10146, Restricted the creation of same membership and activity again.
CRM-12798 contact detail report date filter
CRM-12802 case report date display
Correct params to CRM_Upgrade_Form::doIncrementalUpgradeFinish().
Test cleanup
Fix api_v3_LocBlockTest
More caching fixes for tests
Fix phone failure test
Fix ContributionTest
-- CRM-12809 #1, #2 and #3

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* CRM-12809: Reserved CustomGroups
  http://issues.civicrm.org/jira/browse/CRM-12809
-- CRM-12809 fix for point no 4

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* CRM-12809: Reserved CustomGroups
  http://issues.civicrm.org/jira/browse/CRM-12809
CRM-12809 - For public screens, use phrase "custom field-set"

Per michaelmcandrew, "custom group" shouldn't appear in docs or web UI

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* CRM-12809: Reserved CustomGroups
  http://issues.civicrm.org/jira/browse/CRM-12809