switch to user erlcloud_httpc
Merge remote-tracking branch 'upstream/master' into httpc

Conflicts:
	src/erlcloud_aws.erl
fix cloudtrail and tests to use erlcloud_httpc
fixes for Body always being binary
fix reading metadata credentials
switch to optimized lhttpc
Fix content-type on s3 uploads
Merge pull request #86 from talko/httpc

switch to use lhttpc instead of httpc