added why
Updated why.md
Merge pull request #5 from fogueri/master

stock files added to m-t-o
updated industries
fixed make-to-stock
Fixed Setting up Email
format guide make to stock and make to order
guides; make-to-stock and make-to-order all chapters included.
made changes to make-to-order and added engineer-to-order pages.
minor changes to make-to-order
m-t-o minor changes made. e-t-o pages added.
added app-development
added app-development
added webnotes
fixes
fixes
minor introduction to guides added.
renamed make-to-order;manufacruring,selling and stock files.
added countries
added countries