Adding Chinese translation prepared by Liping Chen, MSU
Merge pull request #22 from openwebwork/release/2.7

Release/2.7
Make OPL the default library instead of NPL

This addresses issue #85
Use internal WWsafe.pm instead of system Safe.pm
Fix default address for libraries.

correct library to libraries
Obtain version number from file VERSION (variable name: $WW_VERSION)
Merge branch 'hotfix1' of http://github.com/openwebwork/webwork2 into develop_tmp

Conflicts:
	conf/localOverrides.conf.dist
Merge branch 'develop' into hotfix0

Conflicts:
	conf/localOverrides.conf.dist
Clean up comments about configuring the path to OPL or NPL