High resource usage #11#12

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mica-angeli wants to merge 5 commits intoros-drivers:masterfrom

Commits on Jun 7, 2018

Fixed CmakeLists.txt so that it can be build in isolated workspace, removed flag std=c++11 as it creates a warning
cosama
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By default the driver publishes the ros time now, behaviour can be changed with ros param device_time
cosama
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Added a raw_sensor_message to get direct access at the unadjusted acceleration data (no gravity subtraction)
cosama
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Commits on Jun 8, 2018

Apply fix (from https://github.com/labust/advanced_navigation_driver) to block on linux reducing CPU usage drastically
cosama
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Commits on Jun 13, 2018

Changed IMU quaternion to agree with REP 103 as in https://github.com/ros-drivers/advanced_navigation_driver/issues/3#issuecomment-372348146
cosama
committed