Fix problem with sorted elements in 'svd_duplicates'.

Merge branch 'hotfix/v0.2.2'

- Add svd_duplicates script to detect derivable peripherals/registers…

…/...

- SVD elements are now comparable

- rst2register generates C-style headers

- Add cluster search to find function.

- Add regular expression to node.Element() and node.Attribute() to re…

…move line feeds inside text.

- Allow derived elements to derive also description field.
- Allow multiple elements of Peripheral().Interrupt() and Peripheral().AddressBlock().
- Replace boolean Derive().derived attribute by Derive().derivedFrom as a reference to the object derived from.
- Add plural 's' to list attributes.
- Add CM35P to type.cpuName (SVD version 1.3.5)
- Add dspPresent attribute to Cpu() (SVD version 1.3.4)
- Add 'What is SVD' section.
- Fix pycodestyle errors.
- Move from pytest-pep8 to pytest-codestyle due to obolete package anouncement.
- Add --version option to script svd2rst, run flake8 on svd2rst and fix errors.
- Define regular expression as raw string to remove deprecated warning.

- Fix travis pypi deployment.

- Extend readme file.
- Move readme file from markdown to rest.
- Remove SVD web ressources.

First release.