Cpe

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* Fixed an issue reported by TauPan. Added cpe.comp as sub-package. https://github.com/galindale/cpe/pull/2. (TauPan)

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New funtionality has not added, only there are small changes:

* Add NEWS.txt file with the updates in the cpe package releases.
* Added issue about language attribute in CPE Names in documentation.
* Changed some files to follow PEP8.
* Fixed language validation method in CPE components with version 2.3.
* Added integration with travis-ci and version badge and Pypi shield/pin images.
* Added option "packages" in setup.py.

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* Fixed an error to check logical values in parsing with CPE names with WFN style.
* Fixed example about convertion methods between CPE styles in naming section.

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* New release.

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* New release.

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* New release.