Modify multibyte keyword search and apply display requirements

1. Modify the number of encoding application from twice to only once.
2. Apply display requirements to search result dialog
3. Each Url in tweet text is linked to the t.co url. This is recommended in the display requirements.
Merge pull request #12 from takatama/search

Modify multibyte keyword search and apply display requirements
fix twitter search from the search box when having accounts of other services
fix tweet styles
Merge pull request #13 from mg6tqq/gap-noscroll

not to scroll a column content when retrieving a gap
make timestamp updates smarter and more efficient

When the timestamp <div>s are created, the “relative-time” class is
added to relative time <div>s that need updates. They are updated
periodically using $(".relative-time").each(...). The “relative-time”
class is removed when the timestamp become absolute and no need to
updates anymore.