Adding ability to externalize config and use string booleans.

[ctoestreich]

Also doing cyclomatic complexity cleanup on code

[stokito]

Hi @ctoestreich
Thanks for your pull request, it's looks cool. Travis Ci says that test are failed https://travis-ci.org/stokito/grails-cookie
Could you check why?
I can do it myself, if you not interested

[stokito]

I reverted some small changes:

1. return keyword is always explicit to avoid errors during refactorings
2. writeCookieToResponse() doesn't change cookie value, so it should be void
3. getDefaultCookiePath(String path = '') was reverted because this default param value never used.

[ctoestreich]

Thanks for adding so quickly. The changes you made above make sense. I noticed that the grails required version was bumped to 2.4 > *. This is not exactly the case. I tested this with 2.2.1, 2.3.8 and 2.4.0 and all versions of grails > 2.2 were able to use the plugin. I reverted the required version back to 2.2 to allow broader use of the plugin. Thanks!

[stokito]

Yep, but problem was with running unit tests, they failed in grails 2.2.0