B3j0f-conf

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- add support for python2.6.

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- add the function model.parser.serialize in order to easily serialiaze Param values.
- simplify driver API in order to make easier the development of new drivers.
- move the logging part from the Configurable class to the specific module configurable.logger.
- set inheritance to Configurable from b3j0f.annotation.PrivateCallInterceptor.
- remove decorator module.
- add foreigns attributes in Configurable which allows to add not specified parameters given by conf resources.
- add autoconf attribute in Configurable, getconfigurables and applyconfiguration functions.
- rename get_conf, set_conf, to_configure and apply_configuration to getconf, setconf, targets and applyconfiguration.
- add Configurable.safe attribute in order to execute configuration in an unsafe context if necessary.
- add the configurable Logger useful to ease management of complex logging needs.

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- add the module model.parser which contains all parser functions provided previously in the class Parameter.
- add serialized value in parameter.
- add the parser eval which evaluates a simple and safe python lambda body expression (without I/O functions).

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- simplify the global architecture in removing both module registry and ParamList.
- separate the module model to three dedicated modules: model.configuration, model.parameter, model.category.
- add model UTs.
- add parameter conf and type in Parameter in order to respectively set initialization parameter value with additional configuration data and force parameter type.
- add regex in parameter name.
- allow to configure parameter values which are configurables.
- add the property Parameter.error which equals an Exception if change of value fired an exception.
- add the module version in order to manage from one access point the project version number.

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- use b3j0f.utils.property.addproperties in order to reduce code lines.
- use the english date time format in the changelog file.

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- add reference to Configurable, ConfigurableRegistry, ConfDriver, Configuration, Category and Parameter in the main package.