* bump logstash-core/logstash-core-event/logstash-core-event-java to 2.4.0.dev
* bump logstash-core-plugin-api to 1.21.0
* provides both get/set and []/[]= events apis by allowing to be installed in logstash >= 2.4 and < 3
* minor bumps on gem dependencies
Fixes#5601
from_json POC
add Event#from_json with corresponding specs
pre-inititalize error class constants
tests for Event#from_json
support array of events in from_json, upgrade to latest jackson
add test for partially invalid json array
cleaned dependencies, removed Guava code
default to java event
also compile java event
use json-unit for json result assertions
remove Java 8 specific constructs to be able to compile on Java 7
use jar-dependencies
better jar file loading
copy jar into lib after build
add post-build copy and clean of gem jar and re-indented file
fix jar destination
include generated jar in gem
remove useless ArrayList constructions
add tests for KeyNode.join method
remove useless shadow and disable unchecked warnings
update gradle dependency to 2.8
fix deprecated asserEquals usage
simplify convoluted list contruction
fix array fields nil values handling
moar nil value tests
simplify for loop
fixed timezone issue
extracted logstash-core and reorganized specs
extracted logstash-core-event
extract java Event into logstash-core-event-java in a proper gem
remove obsolete jruby_event bootstrapping
fix require path
add java code bootstrap
use logstash-core-event/logstash-core-event.rb
remove obsolete files
basic instructions
LogStash::Json need to be initialized from event
update jruby and gradle versions
update compile:logstash-core-event-java rake task
WIP tasks refactor
fix gem.files
skip test if class is not defined
fix gem related tasks for new structure
add gem spec dirs in core tests
bootstrap java implementation when requiring timestamp
new Cloner class and Event clone impl
fix array fields assignments, see #4140
don't rely on json implementation ordering
fix skipped last iterpolation char
remove implementation specific unnecessary check
also require ruby classes
define error class in ruby
raise exception on invalid format
remove implementation specific tests and extract and put logger related test in pending
missing bits for having all core timestamp specs pass
run all core specs
remove leftover
comment regex
missing encoding header
revert to logstash-core-event by default
finished proper gemification
useless require
dynamically pick specs depending on logstash-core-event-* implementation
logstash root package version
missing file for proper gemification
do not build java event by default
always check for root logstash lib dir
fix concurrent-ruby version confict
fix rebase conflict
re-enable specs
user vars instead of constants
move non core code in bootstrap
document version files
move version file
remove useless code
use version in logstash-core
fix gem files list
put back concurrent-ruby version constrain as in master
add dependency on logstash-core-event
remove dependency on logstash-core to avoid circular dependency
fix rebase conflict
remove circular dependency
fix specs
update README
