fixes #159
Merge pull request #162 from pfalabella/fix-integer-inf

fixes #159
Need to specify type for this variable explicitly.
`*T` type has been removed from the language; use `*const T` instead.
Merge pull request #163 from utkarshkukreti/fix-for-rust-master-2014-07-01

Fix for Rust master
Fix 24_game
Fix arithmetic_rational
Fix huffman_coding
Fix json
Fix zig-zag_matrix
Remove trailing whitespace
Implement Equilibrium Index problem.
Merge pull request #164 from utkarshkukreti/implement-equilibrium-index

Implement Equilibrium Index problem.
removed deprecated Duplex from synchronous concurrency
Merge pull request #167 from pfalabella/synch-remove-duplex

removed deprecated DuplexStream from synchronous concurrency
implementation of 24game/solve (squashed)
Merge pull request #166 from pfalabella/24-game-impl

24 game/solve implementation