experiment with hashie version change

"hashie", "~> 1.2.0" 
to
"hashie", "> 1.2.0"
changed version in gemspec

~> changed to >
As per email from @kairos

"One thing to note (this isn’t your issue, but just housekeeping).  

Change your URL to api.kairos.com instead of kairos.io.  That will enable you to use https if you want to (not a requirement). "
Merge pull request #2 from shashanksingh/master

To fix issue #1