Readme update, Widget example fix

• Update intro Readme
• Fixed Widget view include (renamed render() to include())

Improve example content, compatibility with framework 2.1.1

• Replaced View component usage with upgraded version based on Theme Wrapper idea. Now you need only specify "$this->extends('layouts/main')" at the top of the file. Renamed View::render() to View::include()
• Removed CPT Hero, Example; Taxonomy Example from default package
• Added better example of CPT/CT: Employees with Departments grouping
• Added Hero Slider widget instead of Hero CPT
• Replaced usage examples of getting post/term meta (custom fields) with new objects Postmeta, Termmeta
• Updated init of Theme and theme features through Singleton

All these changes won't work without theme framework v2.1

First release candidate

1.0

Updated tested up to 4.9