use % operator instead of format ;; format cannot be used in python < 2.6
add DataLogger clear in setupLogger to start log data with same starting time
Merge pull request #205 from snozawa/replace_ORBInit_string_format

Use % operator instead of format
Merge pull request #206 from snozawa/add_log_clear

Add DataLogger clear in setupLogger to start log data with same starting time
add test to check downstream packages
put new interface to the end
Merge pull request #208 from k-okada/compatible_with_315_1

Compatible with 315 1
check whether setupLogger is arleady executed