Merge branch 'development' into feature/testnet-faucets/order-dispenser

* development: (37 commits)
  Add dates to CHANGELOGs
  Change CHANGELOGs
  Add .editorconfig
  Fix a typo
  Temp
  Use forEach instead of map
  Add PR number
  Fix an exception when a signature collision happens
  Fix prettier
  Add regression tests
  Improve the comment and fix an exception
  Add missing comas
  Lerna-ignore tslint and tsconfig
  Update contract versions, fix tests
  Rename directories
  Rename previous contracts, fix imports, add nested file structure
  Move all contracts into a single directory
  Update import
  Fix import
  Get rid of suffixed contract versioning and replace it with a poor-mans package manager. Versions are stored locally, and are generated in a copy-on-write basis as required
  ...

1 files changed, 73 insertions, 0 deletions

diff --git a/packages/contracts/src/previous/SafeMath/SafeMath_v1.sol b/packages/contracts/src/previous/SafeMath/SafeMath_v1.sol
new file mode 100644
index 000000000..341d611ec
--- /dev/null
+++ b/packages/contracts/src/previous/SafeMath/SafeMath_v1.sol
@@ -0,0 +1,73 @@
+pragma solidity ^0.4.11;
+
+contract SafeMath_v1 {
+    function safeMul(uint a, uint b)
+        internal
+        constant
+        returns (uint256)
+    {
+        uint c = a * b;
+        assert(a == 0 || c / a == b);
+        return c;
+    }
+
+    function safeDiv(uint a, uint b)
+        internal
+        constant
+        returns (uint256)
+    {
+        uint c = a / b;
+        return c;
+    }
+
+    function safeSub(uint a, uint b)
+        internal
+        constant
+        returns (uint256)
+    {
+        assert(b <= a);
+        return a - b;
+    }
+
+    function safeAdd(uint a, uint b)
+        internal
+        constant
+        returns (uint256)
+    {
+        uint c = a + b;
+        assert(c >= a);
+        return c;
+    }
+
+    function max64(uint64 a, uint64 b)
+        internal
+        constant
+        returns (uint64)
+    {
+        return a >= b ? a : b;
+    }
+
+    function min64(uint64 a, uint64 b)
+        internal
+        constant
+        returns (uint64)
+    {
+        return a < b ? a : b;
+    }
+
+    function max256(uint256 a, uint256 b)
+        internal
+        constant
+        returns (uint256)
+    {
+        return a >= b ? a : b;
+    }
+
+    function min256(uint256 a, uint256 b)
+        internal
+        constant
+        returns (uint256)
+    {
+        return a < b ? a : b;
+    }
+}