[SAoC] 'DPP with Linux kernel headers' Project Thread

[Cristian Becerescu]

Update for week 1 of Milestone 2.

I've implemented solutions for the issues discovered in the 
previous 2 weeks and made pull requests as follows:

- Allow multiple clang options to be specified more easily & add 
option to avoid including the system paths by default
https://github.com/atilaneves/dpp/pull/185

- Fix a bug related to multi-line macro definitions
https://github.com/atilaneves/dpp/pull/186

- Fix the renaming of D keywords to be consistent and correct
https://github.com/atilaneves/dpp/pull/187