patch(cmd options): add support for Prince's command line options

lib/princely/pdf.rb

@@ -14,7 +14,8 @@ def initialize(options={})
         :logger => nil,
         :server_flag => true,
         :media => nil,
-        :javascript_flag => false
+        :javascript_flag => false,
+        :cmd_options => []
       }.merge(options)
       @executable = options[:path] ? Princely::Executable.new(options[:path]) : options[:executable]
       @style_sheets = ''
@@ -24,6 +25,7 @@ def initialize(options={})
       @media = options[:media]
       @javascript_flag = options[:javascript_flag]
       @timeout = options[:timeout]
+      @cmd_options = cmd_options
     end
 
     # Returns the instance logger or Princely default logger
@@ -51,7 +53,7 @@ def exe_path
     end
 
     def executable_options
-      options = []
+      options = @cmd_options
       options << "--input=html"
       options << "--server" if @server_flag
       options << "--log=#{log_file}"