handle single quote as brute-force argument tokenizer.
now 'cd' in CoreScript can handle windows absolute path.
batch script running is enhanced.

* line starts with '#' is ignored as if it is comment.
* empty line is simply discarded.
* if a line ends with '\', the next line will be concatenated to prev line.
* can handle bash-like inline redirection
  - if line ends with pattern '<<([a-zA-Z0-9]+)'
  - group(1) is END OF INPUT line-mark.
  - following lines before END OF INPUT mark are used by script as input stream.
    ex) https://gist.github.com/stania/5274560
replace placeholder while executing batch script.