Anycast-healthchecker

* Add support for JSON logging to a remote point

* Catch the error on bird reload due to missing cmd
* Remove unnecessary call to close()

* Update docstring of ip\_prefixes\_check()
* Remove import of an unused exception
* Change the way we handle IP prefixes without check
* Add Ralf Ertzinger in the contributers list
* Add some corrections in README
* Rewrite routing protcol overview
* Add contributers section

* Fix a regression introduced by 168f9aab

* Change the way threads pass operations
* Fix a regression introduced by 37aa574b1159
* Simplify the update of bird configuration
* Call anycast-healthchecker from the virtualenvironment
* Remove unnecessary catch of Empty exception
* Remove unnecessary block on threads
* Modify README based on the feedback received
* ServiceCheck: simplify code by removing superfluous lines
* switch to split from shlex
* tiny changes on modifications from ndemou
* New Introduction + minor spelling, grammar syntax
* More clear and simple introduction

* mention the use of virtualenvwrapper tool in Testing section
* another set of small updates on README
* fix broken reference in README
* several changes on README
* fix typo in README
* use correct statement to include images
* add drawings to illustrate how anycasted traffic is routed
* tiny fixes in README
* local\_run: get only the list of IPv4 addresses
* tiny fixes on README
* fix typos in README
* add details in README on how someone can test the software
* fix typo in README
* local\_run: report if bird is running
* several clean ups on local\_run