Add benchmark for end_with? vs regexp

benchmark/end-with-vs-regexp

@@ -0,0 +1,13 @@
+require 'benchmark/ips'
+
+Benchmark.ips do |x|
+  path_without_ending_slash = '/some/very/very/long/path/to/a/file/i/like'
+  x.report('no slash regexp')    { path_without_ending_slash =~ /\/$/ }
+  x.report('no slash end_with?') { path_without_ending_slash.end_with?("/")  }
+end
+
+Benchmark.ips do |x|
+  path_with_ending_slash = '/some/very/very/long/path/to/a/file/i/like/'
+  x.report('slash regexp')    { path_with_ending_slash =~ /\/$/ }
+  x.report('slash end_with?') { path_with_ending_slash.end_with?("/")  }
+end