Add changelog for 1.5.beta1

Fixes #2182
Add file output fixes

Fixes #2182
Added few more fixes

Fixes #2182
Added more description

Fixes #2182
Changes after review

Fixes #2182
Added performance improvements

Fixes #2182
Adding bootstrap gem to the gem home

Fixes #2203
updated .lock files

Fixes #2203
tmp dummy lock file

Fixes #2203
do not ignore .lock files

Fixes #2203
fix jar-dependencies to version included in JRuby

Fixes #2203
solid path to logstash

Fixes #2203
gem paths settings fix & refactor

Fixes #2203
all gems included in vendor/ glob and add bootstrap for bundler

Fixes #2203
updated lock files

Fixes #2203
remove old lock files

Fixes #2203
refactor to use single gem dir vendor/bundle, use Bundler::CLI, .lock files naming

Fixes #2203
correclty reset bundler, disabled multiple jobs, removed .done file stuff

Fixes #2203
removed coveralls dev dependency, more .bundle dir cleanup, install without parameter fix

Fixes #2203
removed unused code

Fixes #2203