removed dependency on changable lazy_high_charts implementation
Merge pull request #27 from tomgi/activity_by_date_crash

There was a dependency on internal lazy_high_charts implementation, that changed in last release.
Removed that and now it should work with every version of lazy_high_charts.
Bump to 1.0.10
Add utf-8 encoding to layout template
Merge pull request #30 from davidmatas/master

Add support for utf-8 encoding
fixing filling empty days with aggregated data in *_by_author_by_date charts
Bump to 1.0.11