Include the additional mime types contributed by the ERXResourceManager class when asking for the content types dictionary

Without this fix, the _contentTypesDictionary method returns a dictionary containing only the mime types provided by the WOResourceManager class.
make the Pattern static so we don't have to compile it every time
replace with new Logger
Merge pull request #586 from ishimoto/fixERXExistQualifier

Fix ERXExistqualifier Part 2
Merge pull request #585 from hprange/resourceManagerContentTypesDictionaryFix

Include the additional mime types contributed by the ERXResourceManager class when asking for the content types dictionary