Zipper exercise for Elixir
Don't use :math.pow in elixir grains, fix parens

:math.pow(2, 64) == (:math.pow(2, 64) - 1) due to rounding issues,
this is not desirable.

Also move some parentheses to fix an error in the example.
Add warning about :math.pow to elixir grains
Merge pull request #1032 from pminten/elixir-grains-no-math-pow

Don't use :math.pow in elixir grains, fix parens
Added the word "test" to the method names in the test cases so the test runner would execute the tests
Merge pull request #1033 from ahalls/objective_c_assignments

Added the word "test" to the method names in the test cases
Normalize file names in go assignments
Normalize ruby assignment filenames
Tweak contributing guidelines
Normalize clojure assignment filenames
Normalize coffeescript filenames
Normalize scala filenames
Normalize assignment filenames in rust
Normalize assignment filenames in javascript
Normalize assignment filenames in python
Normalize haskell assignment filenames
Normalize elixir filenames
Simplify go octal example
Revert "Normalize haskell assignment filenames"

This reverts commit 72f4663c0f0021aa878c5e06e5775ea2e6cdeab9.
Revert "Normalize assignment filenames in rust"

This reverts commit fb102582057d843ab7d02f6a8ddd152954375ca9.