updated erlang mk to latest version
Added ktn_recipe.

TODO:
* [ ] implement ktn_recipe:verify/1 as a debugging aid.
* [ ] implement ktn_recipe_SUITE.
* [ ] implement a fuller example making use of {mod, fun} steps.
* [ ] document
Implemented verify/1
Added ktn_recipe_SUITE:transition_test/1
Notes & comments
ktn_numbers module.
Merge pull request #10 from inaka/jfacorro.add.numbers.module

Created ktn_numbers module.
Merge remote-tracking branch 'inaka/master'
Modified ktn_recipe to use external funs instead of {module, function} values.
Implemented ktn_recipe:verify/1 as a ktn_recipe
Improved ktn_recipe:pretty_pretty
Documented
Merge branch 'master' into igaray.recipe

Conflicts:
	Makefile
Style
Merge pull request #12 from inaka/igaray.recipe

Igaray.recipe
Moved documentation to README.md
Minor corrections
Merge pull request #13 from inaka/igaray.recipe

Igaray.recipe
Merge pull request #17 from inaka/master

erlang.mk and ktn_numbers module