Update Android Gradle Plugin to 2.3.2, support libs to 25.3.1.

[artem-zinnatullin]

Opened instead of #793.

I now manually download Android SDK which resolves wrong "platform-tools" version problem on Travis CI.

[codecov-io]

Codecov Report

Merging #794 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #794      +/-   ##
==========================================
- Coverage   96.85%   96.85%   -0.01%     
==========================================
  Files          87       87              
  Lines        2638     2636       -2     
  Branches      296      296              
==========================================
- Hits         2555     2553       -2     
  Misses         50       50              
  Partials       33       33

Impacted Files	Coverage Δ
.../storio/contentresolver/StorIOContentResolver.java	100% <0%> (ø)	⬆️
.../com/pushtorefresh/storio/sqlite/StorIOSQLite.java	100% <0%> (ø)	⬆️

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[geralt-encore]

So Travis still doesn't support android-25 api or is it something different?

[artem-zinnatullin]

Yeah, looks like so, never liked their magic dsl

…

On Mon, May 22, 2017, 21:45 Ilya Zorin ***@***.***> wrote: ***@***.**** approved this pull request. So Travis still doesn't support android-25 api or is it something different? — You are receiving this because you were assigned. Reply to this email directly, view it on GitHub <#794 (review)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AA7B3Fk8MfQdLLM-BjzRmw8G1-m4jMv5ks5r8de4gaJpZM4NigtE> .

[artem-zinnatullin]

Codecov thinks that coverage will be reduced by -0.01 which is about its rate of error, so I'm merging this