Adding TSLint and linting the whole project

Author: Sertion

.travis.yml

@@ -4,6 +4,10 @@ os:
   - osx
   - linux
 
+cache:
+  directories:
+    - "node_modules"
+
 before_install:
   - if [ $TRAVIS_OS_NAME == "linux" ]; then
       export CXX="g++-4.9" CC="gcc-4.9" DISPLAY=:99.0;
@@ -17,3 +21,4 @@ install:
 
 script:
   - npm test --silent
+  - npm run lint --silent

package-lock.json

@@ -29,6 +29,7 @@
     "vscode:prepublish": "tsc -p ./",
     "compile": "tsc -p ./",
     "watch": "tsc -watch -p ./",
+    "lint": "./node_modules/.bin/tslint --config .\\tslint.json --project .\\tsconfig.json",
     "postinstall": "node ./node_modules/vscode/bin/install",
     "test": "node ./node_modules/vscode/bin/test"
   },
@@ -41,6 +42,8 @@
     "@types/node": "^9.4.6",
     "mocha": "^5.0.1",
     "nock": "^9.2.3",
+    "prettify": "^0.1.7",
+    "tslint": "^5.9.1",
     "typescript": "^2.7.2",
     "vscode": "^1.1.10"
   },