Check slf4j dependencies

[tuomas2]

AndBible/jsword#14 (comment)

• Check if de.psdev.slf4j-android-logger is coming from some other lib transitively.
• Write explicit dependency for it in jsword dependency specification.

[tuomas2]

Can you @UnasZole check if 309941d looks correct.

[UnasZole]

It seems ok, but why do you exclude("org.slf4j:slf4j-api") ?

slf4j-api is the interface of the logging system.
JSword depends on it because it calls the loggers.
slf4j-android-logger also depends on it because it provides android implementations for these loggers.
So in any case, your application contains slf4j-api, otherwise everything would break.

The only thing your "exclude" does is to force Gradle to take the version of slf4j that is brought transitively by slf4j-android-logger instead of the one from jsword - but in any case, it shouldn't make a difference as far as I know.

[tuomas2]

It seems ok, but why do you exclude("org.slf4j:slf4j-api") ?

slf4j-api is the interface of the logging system. JSword depends on it because it calls the loggers. slf4j-android-logger also depends on it because it provides android implementations for these loggers. So in any case, your application contains slf4j-api, otherwise everything would break.

The only thing your "exclude" does is to force Gradle to take the version of slf4j that is brought transitively by slf4j-android-logger instead of the one from jsword - but in any case, it shouldn't make a difference as far as I know.

Thank you for this explanation! Removed exclusion in bb0798f