Python 3 string fixes and additional tests

[JeffLIrion]

No description provided.

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[coveralls]

Coverage increased (+1.6%) to 43.893% when pulling a8938ca on JeffLIrion:master into 82bfd52 on google:master.

[JeffLIrion]

I signed it!

[googlebot]

CLAs look good, thanks!

[JeffLIrion]

Is there anything you need from me for this pull request? I've got a pull request for another Python package (https://github.com/happyleavesaoc/python-firetv) that uses this ADB library and requires these changes for Python 3 compatibility. If you could review this PR and release a new version so that I can update the requirements for firetv, that would be much appreciated!

[chilicheech]

Any updates on this? This PR is very useful in for me 😄

[JeffLIrion]

I would really appreciate it if you could review this PR. I've got some pull requests that I'd like to submit to other packages -- python-firetv and home-assistant -- that are dependent upon the changes contained in this PR.

[tuxuser]

@JeffLIrion usually pull requests dont bump the package version, the maintainer decides when to do so. Maybe you could change that and see if the coverall test accepts it. However, it makes no sense to me why a version bump interferes with code coverage...

Additionally, you could write tests -> higher possibility of it getting accepted.

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[tuxuser]

I am very okay with contributing to this project!

[tuxuser]

@fahhem Sorry for triggering you, assuming you are quite busy, but it's somewhat urgent. This PR fixes basic py3 compatibility, it would be a great thing to have! Thank you!

[JeffLIrion]

I tried to change the email used by @tuxuser in his commits to the email that he used when signing the CLA, but it made a mess of the repository so I reverted to the state before modifying the commit emails. PR #128 is exactly the same, but all the commits are in my name. Sorry for the trouble!

[fahhem]

Closing in favor of #128