Config file support (like .replyrc)

[pablrod]

Perl REPL environments support some sort of configuration file:

• Reply: .replyrc
• Devel::REPL: .re.pl

This configuration file is useful for loading plugins, helpers or some sort of initialization (like connecting to common databases).

I've made a quick patch of Devel/IPerl/Kernel/Backend/Reply just to load the .replyrc file. But maybe is better to use a proper config file, like .iperlrc.

I can work on this, but let me know if this is something you want or maybe is not the way a notebook should work (without the config file could be impossible to get the same output).