Updated tide module and Jupyter notebook!

[socoyjonathan]

No description provided.

[rjleveque]

It looks like the tide.py file in this PR is almost identical to the one in clawpack/geoclaw#532, should that just be used instead?

Currently the Tide_Module_Examples.ipynb notebook imports tide at the top but then also has
import clawpack.geoclaw.tide as tide
later on in the notebook, so it's using both versions.

[mandli]

Yes.

[socoyjonathan]

Updated jupyter notebook and deleted local tide.py to avoid issues.