Prepare 1.0.2 release and bump to 1.0.3-SNAPSHOT

So here comes a potential release of scala-parser-combinators. Once this is merged:
 - I will tag the first commit of this PR as `v.1.0.2`
 - then I am not sure about the release process (@gkossakowski: how does that work? Is there something I should do?)
 - When it is in the repo, I'll open a PR to scala/scala to migrate to 1.0.2 (before the code freeze for 2.11.2...)
 - and probably some announcement on the ML

@adriaanm @gkossakowski what do you think? did I forget something?

--

v1.0.2 contains only two bug fix:
 - [SI-7710](https://issues.scala-lang.org/browse/SI-7710) fix memory performance of RegexParsers in jdk7u6+ -- 91584dc
 - [SI-4824](https://issues.scala-lang.org/browse/SI-4824) Fixes stack overflow bug when parsing long multiline comments -- f326847