Make it work with WeChat's mini-program.

Version 1.1.3

- Fix copying ltsx.js file in mplify.sh script

Version 1.1.2

- Fixed "doc" npm command

Version 1.1.6

- fixed naming of output directory to be ltsx for WeChat's mini-program

Version 1.1.5

- Fix file extension for outputing ltsx.wxs file

Version 1.1.4

- fixed outputing ltsx.wsx file for WeChat's mini-program to import
defs.wxs as well

Version 1.1.1

- Updated README.md for a correct and proper instruction to install and
use a module with WeChat's mini-program

Version 1.1.0

- added definition file support for working with WeChat's mini-program
- updated mplify.sh script to include such definitions file as such

Version 1.0.0

- Essential APIs to use
- Expose lang constants to user