YAML configs support

[Vyacheslav Matyukhin]

New module: https://github.com/berekuk/Ubic-ServiceLoader-Ext-yaml.

It allows you to write configs in YAML:

О©╫

# in /etc/ubic/service/my.yaml file:
module: Ubic::Service::SimpleDaemon
options:
О©╫ bin: sleep 100
О©╫ stdout: /var/log/my/stdout.log
О©╫ stderr: /var/log/my/stderr.log

О©╫ env:

О©╫О©╫О©╫ PATH: /usr/bin:/bin

О©╫О©╫О©╫ LC_ALL: en_US.UTF-8

О©╫

The difference from .ini configs is that you can't express second-level parameters in .ini (env, for example. Or ulimit, which is not implemented yet but soon will be.)
Didn't release it on CPAN yet - I'm not sure if extra dependency on YAML::Tiny would hurt core distribution, maybe I should just bundle it with everything else.

(I hate this "modular vs batteries-included" dilemma...)