Julia samples (#108)

* Add julialang binary search sample

* Add unit test

* Add julialang selection sort sample

* Change julia suffix to jl

* Add recursion and quick sort with tests

* add quick sort

* Add hash table samples

* Add BFS

* Changed file names

* Add dijkstras

* Add Dijkstras test

05_hash_tables/julia/01_price_of_groceries.jl

@@ -0,0 +1,2 @@
+book = Dict("apple"=> 0.67, "milk"=> 1.49, "avocado"=> 1.49)
+println(book)

05_hash_tables/julia/02_check_voter.jl

@@ -0,0 +1,13 @@
+function check_vote(name)
+	if voted.get(name)
+		println("kick them out!")
+	else
+		voted[name] = true
+		println("let them vote!")
+	end
+end
+
+voted = Dict()
+check_vote("tom")
+check_vote("mike")
+check_vote("mike")