Improvements on documentation (#340)

* Improvements on documentation and some refactor

* ts | js -> typescript (docs)

src/plugins/ble.ts

@@ -24,7 +24,7 @@ import { Observable } from 'rxjs/Observable';
  *
  * Peripheral Data is passed to the success callback when scanning and connecting. Limited data is passed when scanning.
  *
- * ```ts
+ * ```typescript
  *   {
  *       "name": "Battery Demo",
  *       "id": "20:FF:D0:FF:D1:C0",
@@ -34,7 +34,7 @@ import { Observable } from 'rxjs/Observable';
  * ```
  * After connecting, the peripheral object also includes service, characteristic and descriptor information.
  *
- * ```ts
+ * ```typescript
  *   {
  *       "name": "Battery Demo",
  *       "id": "20:FF:D0:FF:D1:C0",
@@ -93,7 +93,7 @@ import { Observable } from 'rxjs/Observable';
  *
  * ### Android
  *
- * ```ts
+ * ```typescript
  *   {
  *       "name": "demo",
  *       "id": "00:1A:7D:DA:71:13",
@@ -108,7 +108,7 @@ import { Observable } from 'rxjs/Observable';
  *
  * Note that iOS uses the string value of the constants for the [Advertisement Data Retrieval Keys](https://developer.apple.com/library/ios/documentation/CoreBluetooth/Reference/CBCentralManagerDelegate_Protocol/index.html#//apple_ref/doc/constant_group/Advertisement_Data_Retrieval_Keys). This will likely change in the future.
  *
- * ```ts
+ * ```typescript
  *   {
  *       "name": "demo",
  *       "id": "D8479A4F-7517-BCD3-91B5-3302B2F81802",
@@ -137,7 +137,7 @@ import { Observable } from 'rxjs/Observable';
  *
  * This means that you need convert your data to ArrayBuffers before sending and from ArrayBuffers when receiving.
  *
- * ```ts
+ * ```typescript
  *   // ASCII only
  *   function stringToBytes(string) {
  *      var array = new Uint8Array(string.length);