use caret for jasmine-node dependency

according to this issue jasmine-node threw errors when using a new version of jasmine-reporters. they downgraded their dependency to only use 1.x.x versions

this pull request just upgrades the dependency to jasmine-node to the current version + uses a caret instead of a tilde. that means that all minor upgrades (and not just patches) of jasmine-node will be automatically installed in the future.

if you are not comfortable using the caret (i know their a pro's and con's), please at least upgrade the jasmine-node-version