Add RSpec conf: filtering and random ordering
Allow json 1.8
Fix Restforce::Mash for hashie 2.0

- #dup should use same arguments with #initialize
- #type is removed
Allow hashie 2.0.x
Upgrade rspec and webmock
Use Ruby 1.8 hash syntax
Merge pull request #78 from chulkilee/update-dependency

Update dependency - JSON and Hashie
Merge pull request #79 from chulkilee/update-test

Update rspec, webmock and add rspec configuration