Adding hailstone sequence example
Remove warning for sudoku file
Remove unused variables in sudoku_grid
Replace Obsolete feature for letter_frequency_example
Replace anchors with explicit types.
Improve readability, use the local convention
Replace URI annotation with EIS annotation. Update Style. Remove exportation to NONE for class with no attributes and then using only pure functions.
Adding explicit guideline for contributors into GUIDELINES file
Adding fork example and minor changes
Minor change
Merge pull request #4 from Conaclos/release_1

EIS and more