Revise GA based split combiner (#432).

-- generic GA parameters
com.asakusafw.input.combine.ga.generation = 100
com.asakusafw.input.combine.ga.population = 50
com.asakusafw.input.combine.ga.mutation = 0.001

-- GA initialization parameters
-- # locality hint for initial genes
com.asakusafw.input.combine.ga.initialLoacality = 0.8

-- GA evaluation parameters
-- # score = worst-time + average-time * (averageTimeWeight)
com.asakusafw.input.combine.ga.averageTimeWeight = 1.0
-- # time penalty factor for non-local splits
com.asakusafw.input.combine.ga.nonLocalPenalty = 2.0
Changed ORC File default stripe size (#403).
Fixed to read empty record file of Parquet (#409).
Tuned application intermediate file format (#423).
Improve DecimalOption ser/de performance (#433).
Add allow_linefeed for Direct I/O TSV (#434).
Bumps up maven-findbugs-plugin version (#422).
Merge remote-tracking branch 'private/issue/422-M25' into 0.7-develop
Merge remote-tracking branch 'private/issue/432' into 0.7-develop
Merge remote-tracking branch 'private/issue/403-M25' into 0.7-develop
Merge remote-tracking branch 'private/issue/409-M25' into 0.7-develop
Merge remote-tracking branch 'private/issue/423-M25' into 0.7-develop
Merge remote-tracking branch 'private/issue/433' into 0.7-develop
Merge remote-tracking branch 'private/issue/434' into 0.7-develop
Merge tag '0.7.0-M25' into 0.7-hadoop1-develop

Released version 0.7.0-M25
Fixed checkstyle warning (#422).
Add findbugs exclude rule (#422).
Add commons-io for building hadoop 1.0.3 (#435).
Fixed for building hadoop-1.0.3 (#406).
Refactor Direct I/O APIs for 0.7 (#422).