Remove velocity input for all functions. Only require Reynolds numbers and Prandtl number.

[lcarasik]

The current pressure drop function for GG includes the Reynolds number as an input. This should be directly calculated from the provided free stream velocity.

[lcarasik]

This should actually be done where Reynolds number and Prandtl number is an input to each function. The Reynolds number and others should be calculated in a wrapper for the user to use.

[lcarasik]

This will require the following:

• Add function to calculate Reynolds number for both in-line and staggered geometries.
• Update friction factor GG
• Update friction factor Zu
• Update Nusselt GG
• Update Nusselt Zu
• Updating the master_example.py