Add timer display and animation period control

Period of wave dispersion relation can now be set
Merge branch 'master' of https://github.com/pabennett/WaterCaustics
Add utility function for drawing numpy arrays.
Update .gitignore
Fix bug in hTilde0 generation, use complex gaussian random varible.
Ignore debug script file
Merge branch 'master' of https://github.com/pabennett/WaterCaustics