(#80) node to element interpolation fix

[bhosale2]

Fixes #80, by

1. Adding momentum conserving node-to-element interpolation for velocity.
2. Renaming older node-to-element interpolation as to be used for position.
3. Specifically naming the node-to-element interpolation used for mass/forces (edge special treatment).

@armantekinalp I ran the snake and flagella, and they produce results as expected.

[codecov-commenter]

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[skim0119]

@bhosale2 Instead of renaming, can you make an alias and leave a deprecation warning?

[bhosale2]

@skim0119 per discussion with @armantekinalp in aacc827:

1. For the pure renaming, as per your suggestion I have added an alias with a deprecation warning.
2. For the velocity interpolation, the function signature and computation itself change, so to avoid the users using the incorrect version, we now raise a NotImplementedError in the old version, with reference to the correct versions in the error message.

[armantekinalp]

Should we add tests for depreciated functions to keep coverage at the same level. What do you think @skim0119 , @bhosale2

[bhosale2]

@armantekinalp we can use pytest.raises and pytest.warns to test those functions.

[skim0119]

I'm adding little more info for the deprecation note.

[bhosale2]

@armantekinalp and @skim0119 tests for the deprecated/not impl. versions have been added in 376ece2.

[skim0119]

@armantekinalp
Coverage is not working. Can you double check the token?

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[armantekinalp]

It is working now, I updated the secret token

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[armantekinalp]

LGTM