fix history xss
Prevent more xss attacks
Merge pull request #137 from taigaio/bug/1500/xss

fix history xss
Fix bug #1512: Change empty description placeholder
Add ico copy to clipboard
fix #1511
Merge pull request #140 from taigaio/bug/1511/broken-filter-selector

fix #1511
Github login/signup button in login and signup pages :octocat:
Added github button to invitation and invitation html structure refactor :octocat: