Improved examples and documentation

- Per-request parallelism and persistent data REST/Web example
- Protect against failed JSON decoding
- Protect against implied casting in EMS type checks
- Remove unnecessary diagnostic message from EMS on "old" memory attach
- TODO: Python Packaging in dire need of a PR
- Force typecasting in pyEMS error messages
- Restrict inter-language example to Node v6 and later
- Make JS and Py inter-language examples use different EMS namespaces
- Add missing options to EMS new for proper F/E and value initialization

.travis.yml

@@ -6,6 +6,8 @@ os:
 dist: trusty
 
 node_js:
+  - "8.1"
+  - "7.1"
   - "6.1"
   - "5.1"
   - "4.1"