Skip doctests where necessary.

Add example for %cpaste

Wrote example for 'colors' command Work done as a team by: -- V Sowjanya <hai.sowjanya@gmail.com> -- N Rajender Reddy <raj.rajender007@gmail.com> -- R Srikanth <sri.rajan143@gmail.com>

Wrote an example for 'pdef' Work done as a team by: -- V Sowjanya <hai.sowjanya@gmail.com> -- N Rajender Reddy <raj.rajender007@gmail.com> -- R Srikanth <sri.rajan143@gmail.com>

Tweaks to RST formatting.

BUG: Do not store class-specific state on TraitTypes since they may be shared through subclassing.

PySide fix: PySide's QByteArray constructor does not overload for unicode.

Improved error message for Qt API switcher.

kernel sends reply on the right side of std<x>.flush

fix+test %who_ls type checking, skip %who doctests due to new docstring output being based on clean user_ns. closes gh-228