Remove support for NodeJS < 4

Closes #529

Author: recrsn

.travis.yml

@@ -8,9 +8,6 @@ os:
   - osx
 
 node_js:
-  - "0.8"
-  - "0.10"
-  - "0.12"
   - "4"
   - "5"
   - "6"
@@ -29,7 +26,7 @@ before_install:
   - echo Building for Node $TRAVIS_NODE_VERSION
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then export CXX=$LINUX_CXX; $CXX --version; fi;
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then c++ --version; fi;
-  - if [[ $(echo "$TRAVIS_NODE_VERSION <= 0.12" | bc -l) ]]; then npm install -g npm@2; else npm install -g npm@latest; fi;
+  - npm install -g npm@latest
 
 install: true
 

appveyor.yml

@@ -1,13 +1,5 @@
 environment:
   matrix:
-  - nodejs_version: "0.10"
-    platform: x64
-  - nodejs_version: "0.10"
-    platform: x86
-  - nodejs_version: "0.12"
-    platform: x64
-  - nodejs_version: "0.12"
-    platform: x86
   - nodejs_version: "4"
     platform: x64
   - nodejs_version: "4"
@@ -33,8 +25,7 @@ install:
   - where npm
   - where node
   - ps: Install-Product node $env:nodejs_version $env:platform
-  - 'if %nodejs_version% lss 4 npm install -g npm@2'
-  - 'if %nodejs_version% geq 4 npm install -g npm@latest'
+  - 'npm install -g npm@latest'
   - 'if "%nodejs_version%_%platform%" == "4_x86" (npm config set -g cafile=package.json && npm config set -g strict-ssl=false)'
 
 build: off

lib/promises.js

@@ -7,11 +7,6 @@
 /// @return {Promise} a Promise encapuslaing the function
 module.exports.promise = function (fn, context, args) {
 
-    //can't do anything without Promise so fail silently
-    if (typeof Promise === 'undefined') {
-        return;
-    }
-
     if (!Array.isArray(args)) {
         args = Array.prototype.slice.call(args);
     }
@@ -35,12 +30,5 @@ module.exports.promise = function (fn, context, args) {
 
 /// @param {err} the error to be thrown
 module.exports.reject = function (err) {
-
-    // silently swallow errors if Promise is not defined
-    // emulating old behavior
-    if (typeof Promise === 'undefined') {
-        return;
-    }
-
     return Promise.reject(err);
 };

package.json

@@ -14,7 +14,7 @@
   "version": "1.0.3",
   "author": "Nick Campbell (https://github.com/ncb000gt)",
   "engines": {
-    "node": ">= 0.6.0"
+    "node": ">= 4.0.0"
   },
   "repository": {
     "type": "git",