Shut down DataRequestSession after create and use.

Signed-off-by: wouyang <wouyang@actuate.com>
Merge pull request #25 from wanbinouyang/master

Shut down DataRequestSession after create and use.
Endless loop and out of stack over flow error is found when preview
chart.
Fixed by filtering invalid aggregate binding when switching data source
remove chart/report examples from org.eclipse.birt.example feature
remove samplesview/samples from nl feature
update localization

Signed-off-by: wyan <wyan@actuate.com>
Updated git_i18n.encode table with expected char encoding and
re-generated all localized files

Signed-off-by: wyan <wyan@actuate.com>