Adding Strands_tweets node
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added README
Improved management of tweets
Merge branch 'master' of https://github.com/Jailander/strands_utils
Adding preliminary version of the streamer node
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strands_tweet tweet.py is now an action server
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Fixing auto start warning
updating from upstream
Switched strands_datacentre to ros_datacentre in here.
Added two action servers for public engagements deployments.

1. emulates camera sound a a flash using the robot hardware for taking pictures
2. detects intruders by listening to the people perception topics.
This simply bulk replaces all ros_datacentre strings to mongodb_store strings inside files and also in file names.
Adding sound_play to the run dependencies of fake_camera_effects.

This is a standard hydro package that is used to play the 'click' sound of the camera.
See https://github.com/strands-project/strands_deployment/issues/38
The qr_read_and_tweet node used for the nhm behaviour.

See https://github.com/strands-project/strands_deployment/issues/38
Messages have been renamed when merging nhm state machine into strands file structure. Fixed
ros_datacentre was renamed to mongodb_store.
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