Fix for unstable comparison between string and float and upgrading jasmine-node

 * The condition `operand === 0 || operand === -0` will never be met, if the operand is a string. Demo http://jsfiddle.net/prHDQ/

 * Introducing a new function `toint` which converts a floating point number to an integer.

 * Upgrading `jasmine-node`. The older version of jasmine-node fails when the node's version has a two digit version number. I had to upgrade this to run the tests.