Arduino MCP79412RTC Library 1.0.2

Add depends to library.properties.
Fix compiler warnings in example sketches.
Example sketch bug fix.
Rearrange #includes.
Update keywords.txt file.
Change to use TimeLib.h.
Improved support for non-AVR architectures.
Change license to GNU GPL 3.0.
Move defines not needed in .h file to .cpp file.
Update examples.
Cosmetic and style changes.
Add GNU GPL 3.0 LICENSE.md file.
Add CONTRIBUTING.md file.

Arduino MCP79412RTC Library 1.0.1

Changes in this release

1. Add library.properties file for Arduino library manager.
2. Fix Markdown headings in README.md.
3. Move source files to src directory.