Consider being consistent in dirty flag names

[jslee02]

We're using two naming convention for the dirty flags of the auto updating kinematics: mNeedXUpdate and mIsXDirty. It would be good to have one convention.

I don't have a strong preference here. To me, mNeedXUpdate sounds more natural while mIsXDirty is shorter.

[jslee02]

Now I'm inclined to using mIsXDirty because it seems to be more frequently used in practice. Please let me know if someone has a strong preference here.

[psigen]

I have a slight preference for naming boolean variables with the Is prefix. I find it is easier to find boolean variables semantically if they are all IsX and IsY.

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