Fix for issue #165 escapeHTML/unescapeHTML does not support spaces

[jetNull]

Minor modification that adds nbsp -> ' ' to the list of escaped characters, and added space to the escape characters regex.

Output examples:

escapeHTML('This is a test')
"This is a test"

unescapeHTML("This is a test")
"This is a test"

[rwz]

Wait, this change is incorrect.

nbsp is a non-breaking-space. And this is a completely different character from regular space. It has it's own code and different purpose. Also, there is no point escaping it, since as far as I know it doesn't affect anything.

It makes sense to unescape it properly though. Which can be done quite easily.

[Broham]

When I try to unescape   it does not work. For example if I run this code:

console.log _s.unescapeHTML(" ")

it outputs  

You mentioned that it can be done quite easily. Does this mean it can be done quite easily using the unescape function?