convert problem statements from txt to markdown
Add missing text to problem description.
Merge pull request #65 from sphickson/md

Add missing text to my_first_io problem description.
Fix spelling mistake in Make It Modular problem

idomatic -> idiomatic
Merge pull request #67 from apuchkov/md

Fix spelling mistake in Make It Modular problem
Merge branch 'md' of github.com:rvagg/learnyounode

Conflicts:
	problems/make_it_modular/problem.md
	problems/my_first_io/problem.md
	problems/time_server/problem.md