translated the article User Timing API into Japanese.
modified some in the conclusion
tone adjustment
corrected inconsistency
Translated HTML Imports article into Japanese
some changes in the wording
Merge pull request #1102 from agektmr/imports_ja

Translated HTML Imports article into Japanese
Merge pull request #1103 from ygoto3/userTimingApiTranslation

Translated the article "User Timing Api" into Japanese
Adds Data-binding Revolutions With Object.observe()
Merge pull request #1105 from html5rocks/observe

Adds Data-binding Revolutions With Object.observe()
<style> are now added to the main page by default
Automatically updating the calendar
Object.observe() - addressing some of Rafs feedback
Merge pull request #1108 from html5rocks/more-observe

Object.observe() - addressing some of Rafs feedback
Minor typo fixes to tutorials.yaml
Merge pull request #1110 from html5rocks/even-more-observe

Minor typo fixes to tutorials.yaml
Adding in Vivian as an Author
Adding vivian image
Compresses a lot of the images re: #1104
Typo fixes for Object.observe article