Specify which type of variable is shared with the view.
Fix grammatical errors.

'need' to 'needs'
'controllers' to 'controller's'
Merge pull request #21 from Ada-Developers-Academy/rails_cleanup

Rails: Fixes to controller section
word-wrap, because markdown should be readable in plain-text too :)
Ruby the VM vs Ruby the language

Introduce the Ruby VM and the Ruby Language as two separate but
closely-related concepts. I think this helps combat the "everything in Ruby
is an object except lulz I tricked you these things aren't objects" we had
going on. While I think this is a necessary distinction to make, I'm not
sure I went into enough depth describing each Ruby program as a little universe
consisting only of the concepts introduced in the code it includes. Ruby, of
course, isn't the only way you can interact with the Ruby VM -- yay C-ext in
MRI and Rubinius, & native Java-code in JRuby -- but it is the language *built*
around the concepts that the Ruby VM provides.
remove 'instantiating' term in response to feedback from @AaronCRobinson and @NanoXD
fix typo :/