Sample user insert snippet.

The execute_query command to insert users into a sample database doesn't work with postgres due to the use of database specific string escape quotes. Changed to use the doctrine insert command which is less DB specific and better illustrates the use of DBAL.
merged branch KodoArkivo/patch-2 (PR #596)

This PR was merged into the master branch.

Commits
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d740c4e Sample user insert snippet.

Discussion
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Sample user insert snippet.

The execute_query command to insert users into a sample database doesn't work with postgres due to the use of database specific string escape quotes. Changed to use the doctrine insert command which is less DB specific and better illustrates the use of DBAL.

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by stof at 2013-01-19T11:57:24Z

:+1: