Update underscore to 1.7.0
Update underscore to 1.7.0.

Fix breaking change in _.template.
Added support for Google Analytics events

- Refactored other methods (coding conventions)
- Added comprehensive tests
Merge pull request #1531 from fauvel/issue-1531

Implement Google Analytics event tracking
Merge pull request #1506 from vogdb/issue-1506

Update underscore.js from 1.4.4 to 1.7.0.
update autosize 1.18.16
Merge pull request #1536 from christopheschwyzer/issue-1536

Update autosize.js
Merge remote-tracking branch 'upstream/master' into typography
Encode in-url javascript correctly
Add "iconPosition" param to function.link
onclick argument encoding in {button_link}
Use smarty_function_link in smarty_function_paging
Use {tag} in {link}
Allow to pass "onclick" to {link}
Use href or onclick depending on paging-mode