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I cant find the invert node in composite 2014, I have and a old scene made it with composite 2013 and I have a Invert Node, and it's working, but if I have a new scene and I want to add a Invert Node.... I don't have it any more in the list, look it:
Your screenshot is of the picklist - that's a user-configurable area of the UI (what you're seeing is just the default preset), not a full list of all the available tools by any means.
"~" (or MMB) for the GateUI, swipe right and select the Tools tab. Invert is in the Color Correction category.