Added missing tmp/captchas directory

[rozwell]

Without it captcha images aren't generated.

[barryo]

@rozwell I suspect you have a permissions issue. See this line which, as you can see, creates the captcha directory if it does not exist.

You web server should be able to write to all files under var.

I'll merge this anyway as there's no harm having it pre-created.

[rozwell]

They're pretty restrictive since we're in a test phase, thanks ;)

[barryo]

You may find other stuff breaking if the application cannot write to var/ 😟

[rozwell]

No worries, just fixed permissions to make sure it wont happen 😃