add confirm modals

fix confirm dialog formatting
improve group request approval email
Add total views counter to discussion model

schema updated
Merge pull request #512 from enspiral/feature/discussion-view-counter

Add total views counter to discussion model
Merge pull request #511 from enspiral/feature/approval-email

improve group request approval email
Admin can delete another users comments
Merge pull request #513 from enspiral/feature/admin-delete-comment

Admin can delete posts
Merge pull request #497 from enspiral/admin-confirm-dialog

add confirm modals
Add Discussion#total_views column
Merge pull request #514 from enspiral/feature/discussion-view-counter

Add Discussion#total_views column
Update modernizr and schema.
Add excanvas to application.js
fix blocked-motion email formatting
Bug-fix: Logged out user could not view discussions
Merge pull request #516 from enspiral/bug/logged_out_user_markdown

Logged out user views a discussion
Merge pull request #518 from enspiral/bug/proposal_blocked_email

fix blocked-motion email formatting
bug-fix: markdown toggle issue
Merge pull request #520 from enspiral/bug/logged_out_user_markdown

bug-fix: markdown toggle issue
Fix failing spec.
refactor activity items. fix likes ajax bug