v0.9.5.3

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A bugfix/feature release (and a start at gtk). Happy Christmas everyone!

* #67: Make pastebin URL really configurable.

* #68: Set a__main__ module and set interpreter's namespace to that module.

* #70: Implement backward completion on backward tab.

* #62: Hide matches starting with a _ unless explicitly typed.

* #72: Auto dedentation

- add a hack to add a write() method to our fake stdin object

- Don't use curses interface when stdout is not attached to a terminal.

- PEP-8 conformance.

- Only restore indentation when inside a block.

- Do not decrease the lineno in tracebacks for Py3

- Do not add internal code to history.

- Make paren highlighting more accurate.

- Catch SyntaxError in import completion.