updated version

support cmake3.4+

correct executable directory be used v0.5.2

Merge branch 'aport-irony-mode-hook'

* aport-irony-mode-hook:
  support iron-mode v0.5.1
  Use fboundp, call irony-cdb function correctly
  Fix quoting
  Tell irony where to find compile_commands.json

company-c-headers and README v5.0

- company-c-headers supported
- tested all supported plugin
- take screenshots and updated README

fixed: redguardtoo#39, the first -I flag is missing v0.4.22

- more debug function
- redguardtoo#39, cppcm-trim-compiling-flag is buggy, the first -I flag is missing

fixed: regex to extract target too strict v0.4.21

add more debug code

recursive algorithm to detect target

support semantic v0.4.18