Merge pull request #312 from pdvyas/hotfix

[fix] move version validation to build and serve
[minor] reload a plugin doc
Merge pull request #313 from anandpdoshi/reload-plugin-file

[minor] reload a plugin doc
[minor] Linked With hotfix webnotes/erpnext#1110
Merge pull request #302 from rmehta/master

[permission model] Redesign for webnotes/erpnext#1093
[minor] fixed erpnext.org urls
Merge pull request #316 from anandpdoshi/hotfix

[minor] fixed erpnext.org urls
[minor] move static data middleware to development serve command
handle session stopped
[minor] do not serve statics if NO_STATICS in environ