[Jeb/EC] Added lein 2 support, added optional function param to get hmac signature.
Merge pull request #1 from jebberjeb/querystring

[Jeb/EC] Added lein 2 support, added optional function param to get hmac...
Corrected spelling mistake
[Jeb/EC] Made secret-key paramater optionally a function which takes request
Merge pull request #3 from jebberjeb/master

Made hmac signature source more flexible with an additional optional parameter.