fix namespace conflict for issue.remaining_hours and common_helper remaining_hours. re #830
Merge branch 'bug/830-upgrade'
Revert "Show burndown charts with User timezone dates" Fixes #815

This reverts commit a462a134a34765cf7e1a2543de7e5060cbaa893c.
Reason: using user's timezone here merely influences the Graph legend.
If you happen to cross date boundary against server time, the date
names just shift and display irritating information.
timezone for burndown, explicitly explain what happens with dates/times on burndown

settings page explanation text
sanitize Time.zone in before-test
Merge branch 'feature/burndowntimezone'
taskboard header use fixed positioning, align vertically using js. fixes #828

make room for impediments row

copyright
Merge branch 'bug/firefoxtaskboard'
use before_save hook and do not save twice for fixing remaining hours type, fixes #826