Remove the bootstrap and restore to use default layout
Complete to change plugin's layout to Redmine's default layout
Merge branch 'default_layout'
Merge remote-tracking branch 'origin/master'
Merge pull request #59 from haibt/default_layout

Complete to change plugin's layout to Redmine's default layout
Refactor most of functions to have default layout and have clean codes
Merge pull request #61 from haibt/default_layout

Default layout
fixed bugs screen new issue,create issue,edit issue,change status issue,sort issue
filter on screen boards
filter on screen list
close issue on screen list
show progressbar after close and change sprint issues
change name action filter_issues_onlist and filter_issues_onboard to filter_issues
fix error can't change status issue after create on screen board
remove bottstrap
review and optimize code