TODO cleanup

[njx]

Filed bugs for TODOs in brackets.js and FileCommandHandlers.js. I also removed two TODOs that I thought were unnecessary:

• one that said we should decide whether to opt in or out of JSLint. Since this is just a debug feature for now, and we want it on by default, we don't have to worry about this. If/when we go to make it a real feature, we'll decide as part of that how we want to default it.
• one that said we're disabling context menus for now until we decide what to put in them. At the point if/when we want a context menu, we'll add it, so I don't think we need to track this in the code.