Rename some variables to make scoping more clear

Added a TODO to implement signal introspection since useless code
related to it was removed.

Rename dbuffer.js to dbus-buffer.js

Make dbus-native itself non-callable

The `dbus-native` module shouldn't have a default export AND other
exported methods.

Now you mu...

Don't export fromTree in signature.js

Remove check for console.warn existence

Use dbus.createConnection in lib/server.js

It used to use the module itself as a callable

`console.warn` seems to have existed since node 0.1.x, so this should be
fine?

Update travis node version configuration

Use Buffer.from and Buffer.alloc wherever we deal with Buffers

* Use 4.2 for 4.x since 4.2 is the latest 4.x in last Ubuntu LTS
* Add 8

I don't see a reaso...

Using the `Buffer` constructor is deprecated, so instead we use
`Buffer.from` and `Buffer.alloc`...

Add eqeqeq eslint rule

Remove global.describe in unmarshall-basic

Replace abstractsocket with abstract-socket

Fix message import in tester.js

This seems like the appropriate change since it's the same net api.

Fix code style with eslint

In this case it avoided a variable redeclaration

This still needs to be decoupled obviously, but this satisifies eslint.

There are many `reply` variables defined, so I named them after what they seem to do.

In a few places, the loop variable names had to be changed

This was a `constant-condition` error from eslint

Add missing child var to unixexec transport

Remove unnecessary signature from listActivatableNames

I don't see how unixexec could ever work without this.

`listActivatableNames` takes no arguments.

https://dbus.freedesktop.org/doc/dbus-specification....

Standardize module imports

Changed:

* move all top level imports to the beginning of the file
* use const for imports
...

Remove lots of commented out code

Remove unused marshall1.js file

Remove executable bit from example js files

None of these have a hashbang, so there's no reason for them to be +x

remove trailing spaces from dbusproxy index.html

Use Prettier for code formatting

This is setup like node-mysql2.

This is going to require a bit more substantial fixing than I'm ready to
handle right now.

It's already in optionalDependencies, so we don't need it there.

Use sockjs client from jsdelivr instead of bundling it.

eslint doesn't like trying to lint this minified file and since jquery
already uses a CDN, I don...

Update dependencies to enable Greenkeeper 🌴

trim trailing spaces

remove some unreachable code from dbuffer.js

use 0o prefix when we want octal

These returns will never happen

Unbundle hexy and use the npm package

Remove workaround for deepStrictUnequal in tests

Update minimum Node version to 4.x

`hexy.js` seems to be bundled, so i'm leaving the spaces there.

BUGFIX: methods returning int 0 had an empty message body.

The issue was caused by 'result' being checked for false, but it should
be checked for null.

64bit cleanup

Use Long.js for 64 bit support