Parsing headers is now more tolerant towards white spaces
Reading the header no longer reads too much
Remove EqualWriter as it is not needed
Input tests now passing
Request body now correctly handled
Green threads implementation
Add closable_tcp_acceptor and closable_tcp_stream
Simplify code for accepting incoming requests
Merge branch 'experimental/green-threads' of https://github.com/tomaka/tiny-http into experimental/green-threads