Add D solution

Overloading opCall.
Add a zsh solution
Add D solution
Rename solutions/complete/d/goal.d to solutions/complete/d/soln1/goal.d
Add D dot
C++ solution using template metaprogramming.
Orf's Python submission
Change it's to its.
fixed directory structure for nimrod
Merge pull request #69 from o11c/zsh

Add a good zsh solution
Merge pull request #100 from orf/master

Python submission: inspecting the call stack
Fix directories
Add zsh to the readme
Add editor's picks
Fix sections
Merge remote-tracking branch 'raleksandar/master'

Conflicts:
	README.md
Merge pull request #59 from hugo-dube/master

Add D solution
Fix directories
Merge pull request #92 from derrickturk/master

C++ solution using template metaprogramming.
Fix directories