Update modules and dependencies, change to jsbi

* Drop gulp support
* Migrate long.js to JSBI library (for long math)
* Update karma targets

karma.conf.js

@@ -1,52 +1,26 @@
 module.exports = function(config) {
 
     var customLaunchers = {
-        sl_ie_10: {
-            base: "SauceLabs",
-            browserName: "internet explorer",
-            platform: "Windows 7",
-            version: "10"
-        },
-        sl_safari_7: {
-            base: "SauceLabs",
-            browserName: "safari",
-            platform: "OS X 10.10",
-            version: "8.0"
-        },
         sl_ios_safari: {
             base: 'SauceLabs',
             browserName: 'safari',
             platform: 'iOS',
-            deviceName: 'iPhone 6 Simulator',
+            deviceName: 'iPhone 7 Simulator',
             version: '10.3',
             deviceOrientation: 'portrait'
         },
-        sl_android: {
+        sl_safari_7: {
             base: "SauceLabs",
-            browserName: 'Browser',
-            patform: 'Android',
-            version: '5.1',
-            deviceName: 'Android Emulator',
-            deviceOrientation: 'portrait'
-        },
-        sl_chrome_41: {
-            base: "SauceLabs",
-            browserName: 'chrome',
-            platform: 'Linux',
-            version: '41'
-        },
-        sl_firefox_8: {
-            base: "SauceLabs",
-            browserName: 'firefox',
-            platform: 'Linux',
-            version: '8.0'
+            browserName: "safari",
+            platform: "OS X 10.11",
+            version: "10.0"
         },
         sl_edge_13: {
             base: "SauceLabs",
             browserName: 'MicrosoftEdge',
             platform: 'Windows 10',
             version: '13.10586'
-        },
+         },
         ChromeHeadlessTravis: {
             base: "ChromeHeadless",
             flags: ['--no-sandbox']