adding gnu make as a requirement
adding development section
Add additional files to .gitignore
Merge pull request #56 from jrossi/makefiles-stuff-docs

Makefiles stuff docs
Merge pull request #57 from awiddersheim/fix_git_ignore

Add additional files to .gitignore
most common makefile details
spelling and some more text
Merge pull request #58 from jrossi/more-makefile

More makefile