Refactored importer to single file iteration

In the old version the importer iterated over the import file three times:

1. Blank nodes
2. Concepts and Collections (`:foo rdf:type skos:{Concept|Collection}` triples)
3. Notes, Relations, Labels, …

We (@christophwiemers and I) refactored it to do only one iteration. We achieved it by remembering triples we don't understand jet and trying it again later.
Some more importer optimizations
Not using stupid generated relations anymore
Merge branch 'master' of github.com:innoq/iqvoc into importer
Added a new logger for STDOUT and Rails.logger default
Added time measurement and mode detailed log output
Fixed multi_logger
Disabling indexes in mysql while importing
merged master
fixed trailing whitespace

hat tip to @tillsc's allmighty netbeans
fixed trailing whitespace
removed mysql index tweaks from importer
Merge branch 'importer'