Fix a couple of SimplePager bugs

* Exiting with q was broken by d703320e38.

* We were only removing color codes in the case where the input string
  ends with a newline, which means we were overestimating the length of
  strings that don't end with newlines. After fixing that, SimplePager
  can accurately page through the inspect output for _pry_.

lib/pry/color_printer.rb

@@ -32,7 +32,9 @@ class Pry
 
     def pp(obj)
       super
-    rescue
+    rescue => e
+      raise if e.is_a? Pry::Pager::StopPaging
+
       # Read the class name off of the singleton class to provide a default
       # inspect.
       eig    = class << obj; self; end

lib/pry/pager.rb

@@ -181,7 +181,7 @@ class Pry::Pager
           @row += ((@col + line_length(line) - 1) / @cols) + 1
           @col  = 0
         else
-          @col += line.length
+          @col += line_length(line)
         end
       end
     end