Pythonping

Better error handling when failing to init socket.
Thanks ArlindH

Release to bring some critical patches:

* Issue 28 resolved: Add more explanation in case pythonping fails to resolve the destination hostname. Thanks to 2Max4 for raising this.
* Issue 34 resolved: Add a parameter for the buffer size and increased the default size from 1024 bytes to 2048. Thanks to eleree for raising this and to somervda for proposing the solution
* Added CONTRIBUTING.MD
* Added FAQ section to README.MD, started with some questions explaining the need for root privilege

Correctly add python 3.5 support, in previous versions the support was actually not present.

Version 1.0.6 introduced an AttributeError upon socket closure (thus every time a ping finished). This quick patch fixes that.

Restored support for Python 3.5 (thanks to cxrider), and added a hint in the error message about potential DNS issues (thanks to 2Max4 for pointing this out).

Eventually, DNS problems should be raised with a different error, but that will come with a new minor and not in a patch.

Release is already available for download from PyPI.

ResponseList has now a method "success" to return the status of the executed pings. This is configurable to be true if all responses were successful, most, or at least one.

Thanks to EzR1d3r for the great input for this release.