Backported DMDL TSV support from 0.5-SNAPSHOT.

Conflicts:

	asakusa-sandbox-aggregator/pom.xml
	docs/ja/source/index.rst
Merge branch '0.2-develop' into 0.2-release
Bumped version number to 0.2.7
Fixed pom.xml for DMDL TSV support.
Merge branch '0.2-develop' into 0.2-release
Revised document for DMDL TSV support.
Merge branch '0.2-develop' into 0.2-release