Catkin-izes rosjava_core and upgrades to Gradle 1.5.
Merge pull request #157 from stonier/catkinization

Catkin-izes rosjava_core and upgrades to Gradle 1.5.
use the rosjava_tools to build the repo.
Removed readme.
Update .rosinstall for hydro-devel version.
fixed to check if network interface is up or not
fixed code format
Merge pull request #165 from HiroyukiMikita/hydro-devel

fixed to check if network interface is up or not
Merge pull request #166 from rosjava/rosjava_tools_build

Catkinizing with rosjava_tools
migrating hydro frame naming, now just strings - http://www.ros.org/wiki/hydro/Migration#tf2.2BAC8-Migration.Removal_of_support_for_tf_prefix
shift to our maven repo.
update to tf2_msgs version of TFMessage, closes #171.