Merge pull request #73 from barmstro/bower

Updated bower.json to make docs work
Changed marker generation and clean up code in wat-timeline-axis
Use template repeat instead of appending children programmatically in timeline-item
Using dom element instead of svg element to represent the scrubber
Merge pull request #66 from Jackyjjc/timeline

Fixed timeline overflow issue in wat-wat and some refactoring
Avoid use of ^^ to set height of wat-buttons