fixed #297. Added "true","false","null" to check of SimpleName
Fix documentation bugs

A year of base time is 1.
Fix documentation bugs

A property "elapsedSeconds" means an amount of time in second.
fixed #300. Split Diagnostic for a cycle exists in model dependencies.
Fixed #307.

Port name of MasterJoinUpdate has wrong in operator reference.
Fixed #308.

Updates document for using Direct I/O with splittable configuration on
S3.
Bumps up default dependency hadoop version (#306).
Merge remote-tracking branch 'hishidama/wip/issue/297' into wip/issue/297
Merge remote-tracking branch 'cocoatomo/patch-5' into wip/issue/298 (#298).
Merge remote-tracking branch 'cocoatomo/patch-6' into wip/issue/299 (#299).
Merge remote-tracking branch 'hishidama/wip/issue/300' into wip/issue/300
Fix #302.
New Build System based on Gradle (#301).
Verifying framework version on every unit testing (#303).
Fix bug on closing unprepared RecordReader (#304).
Direct I/O-CSV supports compression and decompression (#305).
Testdriver generate artifacts into tempdir (#309).
Merge remote-tracking branch 'private/issue/297' into 0.5-develop
Merge remote-tracking branch 'private/issue/298' into 0.5-develop
Merge remote-tracking branch 'private/issue/299' into 0.5-develop