start completeness test
completeness test for instance methods in Scala adaptor
Merge branch 'master' of github.com:Netflix/RxJava into completenesstest
extract static methods in completeness test
completeness test now also checks static methods
all move explanations why methods are not present in Observable to CompletenessTest
add zipWithIndex, sum, product, and an explanation why no average
Merge branch 'master' into idiomaticscala
add merge operation and examples

and try to make Olympics groupBy work with timing, but did not
work due to problems with RxJava groupBy, see pull #289
add methods and examples
first and firstOrElse
add distinct and distinctUntilChanged, but

those with custom equality are not yet there because of issue #395
add concat, length, retry; rename replay()->replay, merge->flatten
add `parallel` and example
add mergeDelayError and flattenDelayError
add combineLatest, apply(java Future), remove docu without impl
update Scala TODO list
add markdown export to CompletenessTest
add Scala/Java Observable comparison
delete comparison.md because tooltips do not work on github