Add '--transport local args to dirt run task.

The previous customization which made 'gradlew launch' work
seems to have got lost, so I've reinstated the cutomization
of the 'run' task for the spring-xd-dirt module.
Fix DefaultContainer's updateLoggerFilename to call activateOptions() after setFile()
   - This should activate the currently set file and open it for logging
   - Also modified the logging levels to have INFO for org.springframework.xd
XD-193: Moved all context files to some subdir of META-INF/spring-xd
XD-202: Change twittersearch to use bearer token

Uses an OAuth2Template to perform client-credentials OAuth2 grant
using the consumerKey and consumerSecret as client_id and client_secret.

The TwitterTemplate is then created internall using the bearer token
from the grant.

This reduces the number of parameters required to configure the module.
Update Spring Social Twitter to 1.0.5