* Add diagnostics module in OpenThread
- provide the same diagnostics interface for both CLI and NCP usage
- implement common diagnostics features based on existing platform interface defined in 'include/platform/'
- other more platform specific diagnostics features will be processed under platform layer
- update CLI interface to support diagnostics feature
- update both Posix and CC2538 platform to support diagnostics feature
* Add diagnostics module unit test
- move platform.h from "examples/platform" to "include/platform"
- add test_diag.cpp to test diagnostics module
* Add a configuration option that would enable/disable diagnostics module
Add --enable-diag configuration option to enable/disable diagnostics module when building OpenThread.
* Add 'pretty' target to reformat sources to be compliant with code style.
* Add 'pretty-check' target to check if sources are compliant with code style.
* Update travis-ci script to use 'pretty-check' and enforce code style.
* The 'pretty' and 'pretty-check' targets rely on the 'astyle' tool.
Abtin Keshavarzian