Remove bower and cleanup unused dependencies (#19)

* Delete bower.json

* Remove karma-firefox-launcher and karma-ie-launcher dependencies

* New major version
as bower suggests when removing support

package.json

@@ -1,6 +1,6 @@
 {
   "name": "js-untar",
-  "version": "1.0.2",
+  "version": "2.0.0",
   "description": "untar files in the browser",
   "main": "build/dist/untar",
   "directories": {
@@ -41,8 +41,6 @@
     "jasmine-core": "^2.99.1",
     "karma": "^0.13.9",
     "karma-chrome-launcher": "^0.2.0",
-    "karma-firefox-launcher": "^0.1.6",
-    "karma-ie-launcher": "^0.2.0",
     "karma-jasmine": "^0.3.6",
     "karma-requirejs": "^0.2.2",
     "lodash": "^4.17.10",