Minor ngdoc changes to fix links
Site tidyup for ui-grid.info

Filled in missing content on page, added a more complex example,
shifted link from API to tutorials.
Merge pull request #1504 from PaulL1/front-page-improve

Site tidyup for ui-grid.info
Merge pull request #1503 from PaulL1/minor_ngdoc

Minor ngdoc changes to fix links
Add missing touch-scrolling code back in for render containers
Add animation CSS for spinners, from Fontello
bugfix: file name typo
Merge branch 'master' of https://github.com/angular-ui/ng-grid into 3.0-subgrid