removed stringByAppendingPercentEscapesUsingEncoding as the purpose of this method is to encode strings that are going to be part of a URL, e.g. a search query string.
applied string escape fixes to -(void)fixupRelativeIframeTags and -(void)fixupRelativeImgTags
Merge pull request #359 from josh64x2/issue-351

fix for issue #351 aggressive URL encoding
Upgrade version number to 3.0.0 RC 9