Update tslint to 4.x.x

Closes #166

package.json

@@ -23,7 +23,7 @@
     "sass-loader": "^4.1.0",
     "stylelint": "^7.0.3",
     "ts-loader": "^1.3.2",
-    "tslint": "3.15.1",
+    "tslint": "~4.1.1",
     "webpack": "^1.14.0",
     "webpack-dev-server": "^1.16.2",
     "webpack-fail-plugin": "^1.0.5",

src/components/popover/popover.component.ts

@@ -4,6 +4,7 @@ import {
 } from '@angular/core';
 
 import { Store } from '@ngrx/store';
+import { Observable } from 'rxjs/Observable';
 
 import {
     KeyAction,
@@ -19,7 +20,6 @@ import { Tab } from './tab/tab';
 
 import { AppState } from '../../store';
 import { getKeymapEntities } from '../../store/reducers';
-import { Observable } from 'rxjs/Observable';
 
 enum TabName {
     Keypress,

src/config-serializer/config-items/key-action/KeystrokeAction.ts

@@ -7,7 +7,7 @@ import { KeyAction, KeyActionId, keyActionType } from './KeyAction';
 export enum KeystrokeActionFlag {
     scancode = 1 << 0,
     modifierMask = 1 << 1,
-    longPressAction = 1 << 2,
+    longPressAction = 1 << 2
 }
 
 interface JsonObjectKeystrokeAction {

tslint.json

@@ -11,18 +11,12 @@
         "class-name": true,
         "curly": true,
         "no-construct": true,
-        "no-duplicate-key": true,
         "no-duplicate-variable": true,
         "no-eval": true,
         "no-null-keyword": true,
         "no-shadowed-variable": true,
         "no-switch-case-fall-through": true,
-        "no-unreachable": true,
         "no-unused-expression": true,
-        "no-unused-variable": [
-            true,
-            "check-parameters"
-        ],
         "no-use-before-declare": true,
         "no-var-keyword": true,
         "radix": true,