Add error when missing S3 credentials
Initial implementation of signed url

Needs testing and unit test
Allow signed url also for different HTTP verbs
Add test for signed url requests
Add type spec for signed_url exported function
Merge pull request #6 from tgrk/signed_urls

Signed urls
Explicitly test the content of response for signed urls.
Radically improved documentation.
Fix signed url construction for fakes3
Merge pull request #7 from tgrk/fix_signed_urls

Fix signed url construction for fakes3
Removed unnecessary eunit include from s3_lib.
Implement config reloading
Add basic of config reloading test
Expose function for getting actual config record as public API
Finish test for reloading configuration
Merge pull request #8 from tgrk/reload_config

Reload config
Properly pick master of the deps.
Retry SlowDown errors.
Merge branch 'master' into rewrite

Conflicts:
	rebar.config
	src/s3.erl
	src/s3_lib.erl
	src/s3_server.erl
	test/s3_test.erl
Support streaming for retrieving s3 contents