Add *.exe to gitignore file.
Add *.exe to gitignore file.


Former-commit-id: 0c51baded234c5151ddbee1c26d200d06e24a35b
kmuzalewska/j-pet-framework,kmuzalewska/j-pet-framework,kmuzalewska/j-pet-framework,kmuzalewska/j-pet-framework,kmuzalewska/j-pet-framework