add travis config for node 0.10
updated the .gitignore for intelliJ project files.
Added test for existing queue bind headers function
Updated node versions for travis
Added function to remove header bindings between a queue and an exchange
Test for Queue.unbind_headers function
Updated README.md with details on the queue unbind_headers function.
Missing newline at end of file
manual merge of pull 231 (unbind_headers function)