First draft of refactored Component->Configurable.

* Change input mechanism: replace raw_input instead of stdin. * Made 'kernel' a public attribute of KernelManager.

Added top-level links.rst file to keep useful links in one place that can be included from other files.

IPythonWidget now supports styling the syntax highlighting.

More complete message specification covering all the major types.

Merge branch 'epatters-qtfrontend' into kernelmanager Conflicts: IPython/frontend/qt/kernelmanager.py IPython/frontend/qt/util.py

* Fleshed out IPythonWidget's style control. * Removed magic override code to reflect new magic design. * Misc. cleanup.

Replaced external module for formatting columns with adapted code.

* ConsoleWidget now has better support for non-GUI tab completion. Multiple matches are formatted into columns. * Tab width can now be set at runtime rather than only during initialization. * Added external module columnize.py

Greatly increased frontend performance by improving kernel stdout/stderr buffering.