Update check_modules with HTML::Scrubber  line
Correct typos in Cosign.pm module
Move all problemLibrary configurations to defaults.config and localOverrides.conf.dist. Remove references in site.conf.dist

It was unnecessary and potentially confusing to do problemLibrary customization both in site.conf and in localOverrides.conf
Reduce the scariness of the warning messages about the extra published column which appears in older courses.
Improve completion message indicating that the upgrade process has been completed.
Update distributed configuration files
Merge pull request #64 from mgage/release/2.7

Updates to default configuration files
Merge branch 'release/2.7' of https://github.com/openwebwork/webwork2 into upgraded2.7
Add chinese language  zh_CN.po
Add chines zh_CN.mo file
Merge pull request #67 from mgage/release/2.7

Add chinese language  zh_CN.po
Fixing bugs in prepration for merge into master
- Backported add button bugfix for library browser
- Backported problemPreamble and problemPostamble buxfix
- Backported basic bootstrap integrationf or math3
Fixed site info file
Merge pull request #69 from goehle/upgraded2.7

Backports of Bugs
Fixed problem with Select All buttons
Merge pull request #70 from goehle/upgraded2.7

Fixed problem with Select All buttons
Added a tweak to the randomizer icon on the library page
Fix label position: put problem numbers BELOW bars in the bar graph
Merge pull request #71 from paultpearson/release/2.7

Fix label position: put problem numbers BELOW bars in the bar graph
Remove spaces after C in demoCourse.list

should get rid of the error messages about 'C ' not being recognized.