fixed bug 2394
fixed bug 2395
Fix typo in con-student that broke problem load.

Fix up some indenting.
Merge branch 'master' into jingxian2
Adding completed Dodos problem to the server; updating documentation.
Merge branch 'master' into jingxian2
Clean up of 'sessions.md' file.
Fixing typo in dodos problems.
Merge branch 'ritesh'
fixed check empty expression message
Merge branch 'master' into pradeep
Merge branch 'pradeep'
Bug fix to re-enable the equation box in the node editor of affected nodes when a node is deleted.
Merge branch 'master' of https://github.com/bvds/LaitsV3
The file dojo-install-version should *not* be in git.
Use "git commit -a" or "git add" to avoid this kind of
error.  Don't use "git commit ." and the like.
Rename Undo button to "Clear" in algebraic editor
Merge branch 'master' into jingxian2
Code review for renaming Undo button.
Bug Fix 2381