Add updated_at and create_at to mesh data tables
Add primary key to mesh_term table

The timestamps are not much use if there is no primary key preventing
collisions.
Add primary key to mesh term table install as in the migration in [97b4d14117391b1e68d7cbd45b8c46f8fd285d69]
UC_ID and Galen ID references removed

Fixes the learner and instructor up loaders to no longer look for
galenId, removed it from the instructions for creating a CSV.
Changed UC ID in user creation and CSV uploads to Campus ID.
Merge pull request #642 from jrjohnson/302-meshtimestamp

Add updated_at and create_at to mesh data tables
Merge pull request #644 from jrjohnson/496-fixcsvlabel

UC_ID and Galen ID references removed
corrected given windows version in code comment.
corrected given browser names in code comments.
Merge pull request #647 from stopfstedt/minor-fix

corrected given windows version in code comment.