Added support for the dir flag in #info
Added support for #info for directories
Corrected the description of a spec
Wrote a spec for the return value of #watch
Simplified Observer#join
Corrected the return value of Observer#run
Changed the default host to 127.0.0.1
Don't call the observer handler after a cancel

No test coverage for this, don't know how to delay the response when mocking HTTP requests
Changed Obserer#cancel and #join to return self
Wrote lots of API documentation