modified load_procedures to use sorted file list, and make_proc_doc as same

[dmicky0419]

I want to use `flor' on my Ubuntu environment.
But, I can't use it because of Exception as follow:

micky@micky-worku:~/flor/quickstart$ bundle exec ruby quickstart.rb
/home/micky/flor/lib/flor/pcore/match.rb:2:in `': uninitialized constant Flor::Pro::Case (NameError)
        from /home/micky/flor/lib/flor/core.rb:77:in `require'
        from /home/micky/flor/lib/flor/core.rb:77:in `block in load_procedures'
        from /home/micky/flor/lib/flor/core.rb:77:in `each'
        from /home/micky/flor/lib/flor/core.rb:77:in `load_procedures'
        from /home/micky/flor/lib/flor.rb:38:in `'
        from /home/micky/flor/lib/flor/unit.rb:7:in `require'
        from /home/micky/flor/lib/flor/unit.rb:7:in `'
        from quickstart.rb:4:in `require'
        from quickstart.rb:4:in `'

This patch solves the problem.

[jmettraux]

Thank you very much!