bumped to version 3.9.0
Merge branch 'develop'
cleaning up emails
Scrub urls of email attachments
Merge pull request #422 from nabinhait/hotfix

Scrub urls of email attachments
updated boostrap to 3.1
bugfix in bulk mail
added lxml dependency
more fixes to email
Fxed conflict
Website Sitemap using NestedSet (#421)
Response to a Website Page Request would be json content if ajax else full page html

Related to (#421):
Fixed base template
Blog, Blog Post, Login, App pages
Started with porting Unit Template to Website Group Template
Way to render each template block separately, fixed pages and generators

Started with Website Group rendering (#421)
Website Group rendering (#421)