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Merge pull request #40 from hawesie/master

Added package for automatically tweeting when a robot achieves something
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Odometry mileage calculation.
Merge pull request #42 from hawesie/master

Updated achievements
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correct marathon length
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Merge pull request #41 from cdondrup/mileage

Odometry mileage calculation.
Saves and reads the total mileage from the datacentre.
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Merge pull request #45 from cdondrup/mileage

Saves and reads the total mileage from the datacentre.
Renamed the parameter from mileage to saved_mileage to resolve conflicts.
Merge branch 'mileage' of https://github.com/cdondrup/strands_utils into mileage
Merge pull request #46 from cdondrup/mileage

Reanemd parameter mileage to saved_mileage
The /mileage topic is checked once on startup and the larger of the two values (paramter saved_mileage or published mileage) is chosen to initialise the node.
Merge pull request #47 from cdondrup/mileage

Node checks against published mileage on start-up
Bug fix: Calculation is done in double precision but it is published in float precision to be compatible with the patroller.
Merge pull request #49 from cdondrup/mileage

Bug fix: Calculation is done in double precision but it is published in ...