Merge pull request #125 from brentmiller/master

Adjusting image sizes and improving text readability
Improving v7 related links Razor snippet
Adding v7 DropDown List Property Editor
Linking in DropDown List
Adding DropDown List Keys Property Editor
Add True/False v7 property editor
Updates v7 property editor list with some descriptions
added folder/file permissions docs
updates breaking changes
Update general.md
Update version-specific.md
Update general.md
Update install-umbraco-with-nuget.md
updated v7 upgrade doc
Merge branch 'master' of https://github.com/umbraco/Umbraco4Docs
Update general.md
Update index.md
Update index.md
Image cropper docs
Moar image cropper docs