Revert "Plus symbols in the URL should be converted to spaces when considered as param values. Closes #463."

This reverts commit babe1e84230c57ac2b998324521509a0853131d3.

Conflicts:
	lib/sinatra/base.rb

Fixes #638
add test for + behavior
update CHANGES
Merge pull request #647 from kgrz/master

Added a missing backtick literal in the German README
add @yb66 to CHANGES
Merge branch 'master' of github.com:sinatra/sinatra
Added a div tag around the ToC that makes it easy to hide in sinatra's website intro.html