#23 Move basic method argument checks from IGit* to Git*

[James H. Linder]

Right now, method argument checks are being done in either the Git* methods, the CLI implementations of the IGit* interfaces, or both. Since the end user should only ever use the classes under edu.nyu.cs.javagit.api, it makes sense to only make the basic argument checks in the ...api.commands.Git* methods and not in the implementations of the ...client.IGit* interfaces.

Move all basic argument checks to the edu.nyu.cs.javagit.api.commands.Git* methods.

[James H. Linder]

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This bug can wait until after the 0.1.0 build.

[Nutan Singh]

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I have done it for GitMv and GitBranch.

~Nutan