Fix CommandTJump under Ruby 1.9.x

The jump scanner pulls in a string jumplist. This worked fine under Ruby
1.8.7, where `String#select` operates in a line-wise fashion. Under Ruby
1.9.x, however, it's a private method and explodes. Using `String#lines`
instead makes things work on both Rubies.

Signed-off-by: Wincent Colaiuta <win@wincent.com>

ruby/command-t/scanner/jump_scanner.rb

@@ -31,7 +31,7 @@ class JumpScanner < Scanner
     include VIM::PathUtilities
 
     def paths
-      jumps_with_filename = jumps.select do |line|
+      jumps_with_filename = jumps.lines.select do |line|
         line_contains_filename?(line)
       end
       filenames = jumps_with_filename[1..-2].map do |line|