Merge pull request #6 from ffeldhaus/master

Text Parser fix
Cleanup

- removed attribute class as it is not used anymore
- removed debug statement in text spec
Merge branch 'master' of https://github.com/gwdg/rOCCI-core
Text Parser

- fixed handling of link attributes when the attribute value includes whitespaces
- using regular expressions for parsing link attributes instead of string splitting magic
- fixed setting of source and target attributes