Add coding exercises for Facebook interviews

Add attempts at solving coding problems to Briefcase.

scratch/facebook/todo.org

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+* Array and string manipulation
+** DONE Merging Meeting Times
+** DONE Reverse String in Place
+** TODO Reverse Words
+** DONE Merge Sorted Arrays
+** DONE Cafe Order Checker
+* Hashing and hash tables
+** DONE Inflight Entertainment
+** DONE Permutation Palindrome
+** DONE Word Cloud Data
+** DONE Top Scores
+* Greedy Algorithms
+** DONE Apple Stocks
+** DONE Highest Product of 3
+** DONE Product of All Other Numbers
+** DONE Cafe Order Checker
+** DONE In-Place Shuffle
+* Sorting, searching, and logarithms
+** DONE Find Rotation Point
+** TODO Find Repeat, Space Edition
+** DONE Top Scores
+** DONE Merging Meeting Times
+* Trees and graphs
+** DONE Balanced Binary Tree
+** DONE Binary Search Tree Checker
+** DONE 2nd Largest Item in a Binary Search Tree
+** DONE Graph Coloring
+** DONE MeshMessage
+** DONE Find Repeat, Space Edition BEAST MODE
+* Dynamic programming and recursion
+** DONE Recursive String Permutations
+** DONE Compute nth Fibonacci Number
+** DONE Making Change
+** DONE The Cake Thief
+** DONE Balanced Binary Tree
+** DONE Binary Search Tree Checker
+** DONE 2nd Largest Item in a Binary Search Tree
+* Queues and stacks
+** DONE Largest Stack
+** DONE Implement A Queue With Two Stacks
+** DONE Parenthesis Matching
+** DONE Bracket Validator
+* Linked lists
+** DONE Delete Node
+** DONE Does This Linked List Have A Cycle?
+** DONE Reverse A Linked List
+** DONE Kth to Last Node in a Singly-Linked List
+** DONE Find Repeat, Space Edition BEAST MODE
+* General programming
+** TODO Rectangular Love
+** TODO Temperature Tracker
+* Bit manipulation
+** DONE The Stolen Breakfast Drone
+* Combinatorics, probability, and other math
+** TODO Which Appears Twice
+** TODO Find in Ordered Set
+** TODO In-Place Shuffle
+** TODO Simulate 5-sided die
+** TODO Simulate 7-sided die
+** TODO Two Egg Problem