The default behaviour of gradle when encountering a transitive
dependency which is the same as an explicit dependency, but where the
transitive dependency has a higher version, is to bump the depdendency
which was explicitly added. This meant that the addition of the
bottom navigation library implicitly bumped our support lib to 25.3.0
due to its dependence on it.
The options are:
* Change the 3rd party lib to support 25.2.0 instead of 25.3.0.
* Explicitly exclude the transitive support lib dependency in our build
script (what we have done in the past, e.g. with acra).
* Bump our explicit dependency.
Given the nature of the changes from 25.2.0 and 25.3.0, it seemed like
it was simplest to bump our dep. However, there is a bug
https://code.google.com/p/android/issues/detail?id=251302 which causes
a function we depend on in SwitchCompat to require API 14. Therefore,
this change excludes the 25.3.0 transitive dependencies, allowing our
25.2.0 dep to get used.
In the process, I've noted that there were a few places we opted for
excluding the transitive dependency in the past. These have now been
removed because we have a higher version than they do, and thus they
will no longer drag our old version forward.
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