add support for DELETE, HEAD  methods
get chop_prefix and s3_bucket also from variable like
Merge pull request #1 from tarfik/master

changes
add x-amz- and Date headers, count string to sign size
fix room for escaping count, remove HEAD->GET transform before sign
add x-amz-date if it is set in config
simple tests
Merge branch 'master' of https://github.com/DreamLab/ngx_aws_auth
key in x-amz-meta headers in lowercase version
x-amz-date static ngx_string
space for ?acl
ngx_cpystrn instead of ngx_memcpy
aws_conf->chop_prefix.len should be > 0; some fixes string sizes
multipart and other func support
fix: (p + len) < last when searching value in args
fix headers compare
Merge pull request #5 from DreamLab/master

Extend functionality beyond simple GET