Merge branch 'fix_removing_elements' of https://github.com/wojtekn/devdocs into wojtekn-fix_removing_elements

Conflicts:
	guides/v1.0/frontend-dev-guide/layouts/xml-manage.md
Merge branch 'develop' of https://github.corp.ebay.com/Magento/devdocs_internal into wojtekn-fix_removing_elements
Merge branch 'wojtekn-fix_removing_elements' into develop
Merge pull request #482 from Magento/develop

Develop
Merge pull request #483 from Magento/develop

Develop
Alan Kent's comments on Get Started guide
Merge branch 'master' of https://github.corp.ebay.com/Magento/devdocs_internal into alan-kent
Merge branch 'develop' of https://github.com/magento/devdocs into alan-kent

Conflicts:
	guides/v1.0/frontend-dev-guide/layouts/xml-manage.md
Adding contributor guide (Sasha)
Merge pull request #129 from magento/develop

updates - new contributor guide