Revert truffle upgrade / require edit

Author: cgewecke

README.md

@@ -116,6 +116,11 @@ MyContract.deployed().then(instance => {
   })
 });
 ```
+**Using `require` in `migrations.js` files**: Truffle overloads Node's `require` function but
+implements a simplified search algorithm for node_modules packages
+([see Truffle issue #383](https://github.com/trufflesuite/truffle/issues/383)).
+Because solidity-coverage copies an instrumented version of your project into a temporary folder, `require`
+statements handled by Truffle internally won't resolve correctly.  
 
 **Using HDWalletProvider in `truffle.js`**: [See Truffle issue #348](https://github.com/trufflesuite/truffle/issues/348).
 HDWalletProvider crashes solidity-coverage, so its constructor shouldn't be invoked while running this tool.

circle.yml

@@ -1,6 +1,9 @@
 machine:
   node:
     version: 6.11.0
+dependencies:
+  pre:
+    - rm -rf node_modules/
 test:
   override:
     - npm run test-cov

package.json

@@ -44,6 +44,6 @@
     "merkle-patricia-tree": "~2.1.2",
     "mocha": "^3.1.0",
     "solc": "0.4.8",
-    "truffle": "^3.2.5"
+    "truffle": "3.2.5"
   }
 }