Make files executable
Fix typo

Caused by commit 9c1bef09
Add UTF-8 encoding and remove unused module
Add coin grid, both command line & graph.
Modify to use CoinGridSim.
Add exception handling.
Add test suite for coin simulation.
Merge.
Clean up TestCoinSim
Add TestCoinGridSim
Test on Travis
Replace coin with coin-grid
Update sims to use the correct way of checking if theoretical matches experimental & shift trials from init function to run_trials().
Correct typo
Cleanup of scripts.
Add TestNeedleSim and TestNeedleAngleSim
Add correct implementation of chi-square test.
Remove unneeded dependency.
Cleanup some output.
Remove all print output