Escape apostrophes in docstrings

[JGreenlee]

Fixes an issue that occurs when using the -d / --docat option, where apostrophes in docstrings do not get escaped.

---

__runtime__.py contains one example of this:

Transcrypt/transcrypt/modules/org/transcrypt/__runtime__.py

Lines 247 to 255 in 88af746

	class __Terminal__:
	'''
	Printing to either the console or to html happens async, but is blocked by calling window.prompt.
	So while all input and print statements are encountered in normal order, the print's exit immediately without yet having actually printed
	This means the next input takes control, blocking actual printing and so on indefinitely
	The effect is that everything's only printed after all inputs are done
	To prevent that, what's needed is to only execute the next window.prompt after actual printing has been done
	Since we've no way to find out when that is, a timeout is used.
	'''

Resulting in invalid syntax in the output JS: