oracle transaction support
Zend\Db\Adapter\ParameterContainer - Fixed ParameterContainer to, upon offsetSet, map int-indexed parameter to named-parameter
Zend\Db\Adapter\ParameterContainer - Added more tests and a situation for null insertion
Merge branch 'hotfix/oracle-transaction' of git://github.com/hamilok/zf2 into hamilok-hotfix/oracle-transaction
Fix trailing whitespace in Oci8\Connection class
Created README.md files for each component

- Since we have per-component mirrors of each component, we should have a
  README.md detailing where to create issues and pull requests, and where
  documentation lives; additionally, detailing the license is a generally good
  idea.