Added disable_visit_errors option to Parser

This adds a way to disable all errors during the .visit(object) stage. Parse errors will still be raised, but runtime exceptions such as values being of the wrong type for a function will be ignored. Benchmarks show a 40% speedup in MRI and 500% in JRuby.

lib/jmespath.rb

@@ -23,14 +23,14 @@ class << self
     # @param [Hash] data
     # @return [Mixed,nil] Returns the matched values. Returns `nil` if the
     #   expression does not resolve inside `data`.
-    def search(expression, data)
+    def search(expression, data, runtime_options = {})
       data = case data
         when Hash, Struct then data # check for most common case first
         when Pathname then load_json(data)
         when IO, StringIO then JSON.load(data.read)
         else data
         end
-      Runtime.new.search(expression, data)
+      Runtime.new(runtime_options).search(expression, data)
     end
 
     # @api private