make bookmark description optional, add URL field. fix mock data for rspec
event controller fixed with JSON string by jQuery
fix timeline spec, make it compatible with current bookmark design
fixed some bugs with related issue and fixed up spec tests
associate issues with bookmarks
modify bookmark create method to work with angularjs
correspond to latest change in front-end for bookmark creation
fix bookmark date_happened creation issue
fix add_to_bookmark_btn UI error handling
fix bookmark show method json rendering problem
modify show method for bookmark to display issues
front-end commit point to the one shows issues
fix timeline tag bug
Merge branch 'add-issues' into related-issues

Conflicts:
	kuansim-frontend
fix show timeline issue spec
Merge branch 'related-issues' of github.com:g0v/kuansim-rails into related-issues
now front-end commit point to a working timeline
put back public symlink
Fixed some UsersController code and added spec tests.
Merge branch 'opengraph' into related-issues

Conflicts:
	config/routes.rb