Add cache(int capacity) to Observable
Revert "CompositeException does not mutate nested exceptions by attaching stacks, but instead"

This reverts commit f4ae92aa624923e9a632fb677730a2d6e04595e5.
Remove cycles in CompositeException
Merge pull request #1431 from tomrozb/composite-exception

CompositeException fix for Android
Merge pull request #1393 from gliptak/cachehint

Add cache(int capacity) to Observable
Add perf tests for cache(1) variant
Javadocs for cache operator
Merge pull request #1467 from benjchristensen/cache-docs

Javadocs for cache operator
remove javadoc warnings from cache(); add @since annotation to cache(b)
Increasing timeout

Using low timeout values causes non-determinism in some build environments.