Feature/interrupt support

[vvvlc]

• Support for interrupt related functions like sei(), cli() and attachInterrupt()
• Added contribution guidelines - CONTRIBUTING.md description how to add missing functions to arduino mocks
  • Added ignored files on .gitignore
  • /.cproject
  • /.project
  • */CMakeFiles/
  • **/CMakeCache.txt
  • */.cmake
  • **/Makefile
  • !/Makefile
  • /Testing/*

[vvvlc]

Hi I assume there is something wrong with CI pipeline.

Installing collected packages: pip
  Found existing installation: pip 9.0.1
    Uninstalling pip-9.0.1:
Exception:
Traceback (most recent call last):
  File "/tmp/tmpVSy3A9/pip.zip/pip/basecommand.py", line 215, in main
    status = self.run(options, args)
  File "/tmp/tmpVSy3A9/pip.zip/pip/commands/install.py", line 342, in run
    prefix=options.prefix_path,
  File "/tmp/tmpVSy3A9/pip.zip/pip/req/req_set.py", line 778, in install
    requirement.uninstall(auto_confirm=True)
  File "/tmp/tmpVSy3A9/pip.zip/pip/req/req_install.py", line 754, in uninstall
    paths_to_remove.remove(auto_confirm)
  File "/tmp/tmpVSy3A9/pip.zip/pip/req/req_uninstall.py", line 115, in remove
    renames(path, new_path)
  File "/tmp/tmpVSy3A9/pip.zip/pip/utils/__init__.py", line 267, in renames
    shutil.move(old, new)
  File "/usr/lib/python2.7/shutil.py", line 303, in move
    os.unlink(src)
OSError: [Errno 13] Permission denied: '/usr/local/bin/pip'