Fix a typo in the deferred-callbacks docs.
Update docs/extensiondev.rst

Use `current_app` instead of `self.app`.
Fixing my own pull request #647

Wrote "stdin" instead of "stdout".
flask.g is now on the app context and not the request context
Added proxies to template context
Changing string to text in schema files
Merge pull request #654 from untitaker/print_in_cgi2

Fixing my own pull request #647
Merge pull request #653 from methane/patch-1

docs/extensiondev: Use `current_app` instead of `self.app`
Merge pull request #649 from erikrose/doc-typos

Fix a typo in the deferred-callbacks docs.
Merge pull request #655 from oliversong/master

SQLite doesn't recognize data type "string"
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