urlfetcher: print socket error with appropriate log level
Merge branch 'master' of github.com:reverbrain/swarm
example: increase download timeout, 10ms is not enough
example: comment that timeout is in ms
example: added boost::asio::signal_set to download example
UrlFetcher: Add runtime check for curl version

Otherwise there can be bugs due to different capabilities
thevoid: Added close shortcut to simple_request_stream
doc: Added documentation for Swarm
doc: Added previously ignored doc/*.in files

Removed *.in files from .gitignore
thevoid: Added documentation
doc: Added a bit more documentation
cmake: added boost libs debug
url: added path_components methods
Merge branch 'master' of github.com:reverbrain/swarm

Conflicts:
	swarm/url.hpp
doc: fixed spelling
v0.6.2.0
spec: update version
url: added missing include
download: added missing include
url: fixed boost::optional dereference