added parsers for TargetScan, TargetScanSites and miRTarBase

the TargetScan one required extra parameters (family file) leading to a change in the Parser interface in netlib-core (commit: 68aa2f7c285eb7e69f9e94a60d431c48f89d36a5) resulting in an adaptation of all existing Parsers to comply with the new interface.
adapting to the new parser interface (blame TFe)
and added a parser for TFe and Encode