Merge branch 'hotfix'
Merge branch 'release-0.2.3'
Merge branch 'release-0.3.0'
Merge branch 'release-0.4.0'
Merge branch 'release-0.4.1'
add Formats for BigInt/BigDecimal
add support of JDecimal
update json4s to 3.1.0
update scalaz7 to 7.0.0-M7
set version to 0.4.2
Merge branch 'release-0.4.2'
fix an error
Merge branch 'release-0.4.2' into develop
Merge branch 'hotfix' into develop