add print-intent snippet to analytics and a shim to support it
appease the linter
refactor to use trycatcher (for now) and move shim to lib
ensure we do not send multiple events in chrome
remove controvesial exception handling, shim and console logs
add print-inetnt to js/analytics asset pipeline
Merge pull request #336 from alphagov/print_intent

Print intent
Fix URL reference to locator-icon

This was moved in d62aa21084cd39c3c7d980486d495766b3368172
Merge pull request #416 from alphagov/fix-locator-icon

Fix URL reference to locator-icon