Fix installation via pip

Merge pull request xmlsec#69 from sindrig/master

Fix name collision with lxml's setupinfo.py

Merge pull request xmlsec#68 from mehcode/windows_build

Introduced windows support

Merge pull request xmlsec#67 from mehcode/develop

Merge branch develop to master (prepare version 1.2.0)

Fixed link to examples

Merge pull request xmlsec#60 from mehcode/add_supp_for_inc_namespaces…

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Added binding for method xmlSecTmplTransformAddC14NInclNamespaces xmlsec#59

Merge pull request xmlsec#57 from bgaifullin/master

Added documentation xmlsec#45

Merge pull request xmlsec#51 from bgaifullin/master

fixed loading crypto library for xmlsec >1.2.21 xmlsec#50

Merge pull request xmlsec#49 from bgaifullin/master

Fixed initialization with dynamic crypto library xmlsec#48

Merge pull request xmlsec#47 from bgaifullin/master

Fixed compilation error with xmlsec > 1.2.20 xmlsec#46