Add default condig for info logging level

Hi,

Default config for info level is missing, creating a lot of warnings like that:
Use of uninitialized value in concatenation (.) or string at /Users/pierre/perl5/perlbrew/perls/perl-5.16.3/lib/site_perl/5.16.3/Dancer/Logger/ColorConsole.pm line 52.

I just set a default color to bright_green to the info level

Pierre