Fix XPathFromCSS bug(general) & test case compile error(xcode 7)

[cezheng]

002d2f2
Fixed a bug in XPathFromCSS that mistakenly matches the CSS string rather than token string, test case added for this bug.

94f30a5
Added explicit type cast to fix compilation error for test in Xcode 7 beta, where NSArray returns ObjectType element rather than id. This will not affect previous versions of Xcode. Please refer to 'Objective-C Language Features' in http://adcdownload.apple.com/Developer_Tools/Xcode_7_beta_4/Xcode_7_beta_4_Release_Notes.pdf

[cezheng]

It turns out that more bugs are found with Ono that I fixed in my Swift port. So closing this PR for now.

[mattt]

Apologies for being away for so long. I appreciate that you took the initiative to port Ono into Swift in my absence, and thank you for your work on this an other contributions.

I cherry-picked 002d2f2 into master. The changes in 94f30a5 were applied previously by a different commit.

You mentioned that you found additional bugs that you fixed in your Swift port. If you happen to recall what they are, I'd be very happy to address them in this project as well.

[cezheng]

Welcome back.

It's been a long time, so I might have missed some of them:

• resetting libxml's last error. I don't remember exactly the context where it went wrong, but there should be some place that the remaining last error will report incorrectly.
  https://github.com/cezheng/Fuzi/blob/master/Sources/Document.swift#L126
• xmlXPathFreeObject seems to be added already by you a few hours ago

[mattt]

Thanks for following up, @cezheng. It's good to be back.

I just added the missing call to xmlResetLastError() in the document initializer with e428e06. If you remember any other bugs that you fixed, please let me know. Thanks again!

[cezheng]

Thanks for the swifty fix:) But I think you also need one in HTMLDocumentWithData;)

[mattt]

Nice catch :)

Fixed by 05cb155. Thanks again!