log statements.
add SyncResponseModificator.
clean up unsused code.
use implicit conversions.
add conditional response modificator.
make use of the new when condition for ResponseModificators.
fix typo.
Close input stream after copying.
make more extensible for more encoding schemes.
bugfix for chaining ResponseModificators.
accept header handling.
Improve and test Accept header parsing.
add gzip compression of outgoing text files (html and such).