Test updates and bump to android-23

[eighthave]

This should hopefully get the tests running successfully in the travis-ci builds. I also purged the old, unmaintained TLS Presense tests. I think we can do all that those tests did in JUnit style tests using services like https://badssl.com

@commonsguy

[commonsguy]

By eyeball, this seems fine. Note that raising the targetSdkVersion to 23 means that you have to deal with runtime permissions, though I am not sure that there are any dangerous permissions floating about.

[eighthave]

Hmm, I think using netcipher only affects INTERNET permissions. Would compiling with android-23 mean changes if this lib only needs INTERNET perms? I thought that was automatic anyway.

[commonsguy]

Would compiling with android-23 mean changes if this lib only needs INTERNET perms?

Nope, that's fine. *_EXTERNAL_STORAGE would be a problem, for example.

I thought that was automatic anyway.

Insofar as the user isn't prompted about it from the Play Store, yes. You still need <uses-permission> for it, though.

[eighthave]

hmm, ok, I'm going to skip 23 now, since it also required useLibrary 'org.apache.http.legacy'

[commonsguy]

You weren't using the built-in HttpClient, I thought. I thought you were using ch.boye, which will exist regardless of compileSdkVersion. Perhaps my memory is fuzzy.