Fix some inaccuracies in haskell.html.markdown

- The bottom of the "List and Tuples" section may mislead the reader
  into thinking that the `fst` and `snd` functions can be applied to any
  tuple; it's worth mentioning that those functions only apply to pairs.

- The example demonstrating the use of the function-application operator
  (`$`) in combination with the function-composition operator (`.`) seems a
  bit contrived. For completeness, I've added an example that uses `$` alone.

- "If statements" and "case statements" are actually expressions, in
  Haskell; I've replaced all occurences of the word "statement" appearing in
  that context by the word "expression".

- Minor wording improvement (replaced "because" by a semicolon).
Merge pull request #872 from Jubobs/master

Fix some inaccuracies in haskell.html.markdown
fix #873
Merge pull request #874 from martinhath/master

fix #873
Added 'git stash'!
Only bashified the code sections
Small formatting changes
Added ourselves to the contributor section
Merge pull request #875 from LOZORD/master

[git/en] Added `git stash`
Fixed some markdown formatting issuses
Merge pull request #876 from LOZORD/master

[git/en] Fixed some markdown formatting issuses
Fixed some misspelling words for pt-br language
Merge pull request #877 from pisandelli/master

Fixed some misspelling words for pt-br language
Merge remote-tracking branch 'upstream/master'