Get-mac

Added
* Attempt to use Python modules if they're installed. This is useful
for larger projects that already have them installed as dependencies,
as they provide a more reliable means of getting information.
* `psutil`: Interface MACs on all platforms
* `scapy`: Interface MACs and Remote MACs on all platforms
* `netifaces`: Interface MACs on Non-Windows platforms
* New methods for remote MACs
* POSIX: `ip neighbor show`, Abuse of `uuid._arp_getnode()`
* New methods for Interface MACs
* POSIX: `lanscan -ai` (HP-UX)

Changed
* Certain critical failures that should never happen will now warn
instead of failing silently.
* Added a sanity check to the `ip6` argument (IPv6 addresses)
* Improved performance in some areas
* Improved debugging output

Fixed
* Major Bugfix: search of `proc/net/arp` would return shorter addresses in the
same subnet if they came earlier in the sequence. Example: a search for

Fixed
* Fixed identification of remote host on OSX
* Resolved hangs and noticeable lag that occurred when "network_request"
was True (the default)

Fixed
* Remote host for Python 3 on Windows

Added
* Short versions of CLI arguments (e.g. "-i" for "--interface")

Changed
* Improved usage of "ping" across platforms and IP versions
* Various minor tweaks for performance
* Improved Windows detection

Fixed
* Use of ping command with hostname

Dev:
* Improvements to internal code

Nothing changed. PyPI just won't let me push changes without a new version.

Added
* Checks for default interface on Linux systems
* New methods of hunting for addresses on Windows, Mac OS X, and Linux

Changed
* CLI will output nothing if it failed, instead of "None"
* CLI will return with 1 on failure, 0 on success
* No CLI arguments now implies the default host network interface
* Added an argumnent for debugging: `--debug`
* Removed `-d` option from `--no-network-requests`

Fixed
* Interfaces on Windows and Linux (including Bash for Windows)
* Many bugs

Removed
* Support for Python 2.6 on the CLI

Dev
* Overhaul of internals