git added hash option usage sample
updated readme
migrating to aws-signer 0.1.1
made aws-signer global variable instead of credentials variable
fixed problem which was previously causing failure and some small optimizations
Merge pull request #5 from bekzod/master

Added hash usage sample and updated readme
Merge pull request #7 from bekzod/aws_sign_0.1.1

Aws sign 0.1.1 #6
refactoring