Pyros-common

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- Relaxing dependencies version requirements to work cross distros.
[AlexV]

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- V0.5.3. [AlexV]
- Expliciting constructor as it might be useful to manager different
version of Python Exceptions. [AlexV]
- Fixing exceptions to get any number of args. adding test. [AlexV]
- Fixing version in changelog. [AlexV]

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- Adding pyup config. [AlexV]
- V0.5.2. [AlexV]
- Fixing tox config. [AlexV]
- Adding rosdistros to travis build. [AlexV]
- Dropping py3 travis checks. still hanging... [AlexV]
- Extracted tests from package. now testing py3 environments added
requirements matching ROS distros for testing. reviewing ABC usage.
[AlexV]

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- V0.5.1. [AlexV]
- Adding common package to hold crossprocess exceptions. [AlexV]

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- V0.5.0. [AlexV]
- Cosmetics and comments for future API upgrade. [AlexV]
- Adding tests for configuration after init. [AlexV]
- Now handling args and config in child context. [AlexV]
- Now handling interface setup as part of context to guarantee
availability after start() call. now using pytest. [AlexV]
- Added badges. [AlexV]
- Removing pyros requirements. not needed anymore. [AlexV]
- Not using pyros_setup anymore here, since we do not depend on ROS
environment for common or mock. [AlexV]
- Remove ROS build files, now useless here since this is just a python
package. [AlexV]
- Fixing cmakelists.txt after reverting to normal package. [AlexV]

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- Updating changelog. [AlexV]
- Fixing setup.py to point to normal pyros-common package. [AlexV]
- V0.4.2. [AlexV]
- Fixing setup.py commands after pacakge structure change. [AlexV]
- Dropping the namespace idea, since we cant make a working deb pkg out
of it. [AlexV]
- Preparing ros release... [AlexV]