Merge pull request #44 from wick-ed/master

reformatting and minor updates
Add append flag to addHeader() method to allow headers with multiple values
Merge with techdivision
Merge pull request #45 from wagnert/master

Add append flag to addHeader() method to allow headers with multiple val...
Merge pull request #46 from wagnert/master

Remove additional line break on 302
Remove additional line break on 302
Bugfix that browser are waiting when receiving a status > 302 without content-length: 0
Merge pull request #47 from wagnert/master

Bugfix that browser are waiting when receiving a status > 302 without co...
readded access logger
Merge pull request #49 from zelgerj/master

readded access logger
added the most important HTTP status of all