#358 Added validation attributes to create page API request and created infrastructure for validating requests
Merge branch 'dev' of github.com:devbridge/BetterCMS into dev
#358 Added validation attributes to API requests
#358 Created attribute for virtual path validation, added validation methods in all API saving methods
#358 Virtual path validation attribute used in ViewModels.
#421 Blogs / pages / contents API methods: added filtering by status
#446: version info checker added.
Merge branch 'dev' of github.com:devbridge/BetterCMS into dev
Merge branch 'dev'