Fixed #303

* Version 0.5.2 of this feature does not work correctly so
reopened at milestone 0.5.3.
Refine DMDL syntax error messages (#312)
Skips task execution if the input resource does not exist (#316).
Fixed #317.

Fails standalone use of framework organizer plugin.
Fixed #318.

Fails compileTestJava task when main SourceSet file does not exist.
Generates asakusafw project prefs on eclipse task (#319).
Changes archetype pom.xml repos order to avoid unnecessary access (#321).
Sets eclipse project encoding settings with core.resource.pref (#322).
Fixed #327.

Unreadable error message when compiling Flow DSL with non-wired
operateor.
Fixed #330.

Unreadable error message when Direct I/O may override another model
output.
Supports Excel 2007 (*.xlsx) format on TestDriver (#335).
Fixed #336.

Simplifies default log format settings on template project
Supports JDK7 (#314)

* Modified testcase for changing Java7 SimpleDateFormat.
* JRE_CONTAINER on build.gradle sets from sourceCompatibility
* Deletes Java version settings from archetype-pom.
* modify supported version of annotation procs
Merge remote-tracking branch 'private/issue/303' into 0.5-develop
Merge remote-tracking branch 'private/issue/312' into 0.5-develop
Merge remote-tracking branch 'private/issue/314' into 0.5-develop
Merge remote-tracking branch 'private/issue/316' into 0.5-develop
Merge remote-tracking branch 'private/issue/317' into 0.5-develop
Merge remote-tracking branch 'private/issue/318' into 0.5-develop
Merge remote-tracking branch 'private/issue/319' into 0.5-develop