Fix issue #1593.
Fix issue #1593.

When specifying a namespace with an absolute file path (starting with /) the file was not being found as the namespace was used as part of the path.
pombredanne/yara,pombredanne/yara,VirusTotal/yara,wxsBSD/yara,wxsBSD/yara,VirusTotal/yara,pombredanne/yara,VirusTotal/yara,hillu/yara,VirusTotal/yara,hillu/yara,pombredanne/yara,pombredanne/yara,hillu/yara,wxsBSD/yara,wxsBSD/yara,hillu/yara,hillu/yara,wxsBSD/yara,VirusTotal/yara