As described in #68, limits the ability for users to delete quickmail history.

I am unclear as to which role(s) we would prefer to give this capability to.
This commit sets it to the role 'Manager', though 'Course Creator' might be more appropriate.
fixes #65 by causing the list to be sorted by last name.

Depending on the global config for full name display, this makes more or less sense.
Providing a choice in the form would be ideal...this is quick.
fixes 66
Merge branch 'master' of github.com:lsuits/quickmail
stash point
adds debug version of solution to #73
per rrusso, adds secondary sort
offers a comparison of three solutions to issue #73
adds a random russian roulette selector for the result set to return
replaces original get  method with direct DB query authored by @danielbush
Merge branch 'master' of git://github.com/lsuits/quickmail
Merge branch 'master' of git://github.com/lsuits/quickmail
Merge branch 'master' of git://github.com/lsuits/quickmail
Merge pull request #78 from lsuits/qm_65

fixes #65 by causing the list to be sorted by last name.
Merge pull request #79 from lsuits/quickmail_68

As described in #68, limits the ability for users to delete quickmail hi...
Merge pull request #80 from lsuits/qm73

Qm73 fixes #73 closes #75
securing email attachments
Merge pull request #95 from lsuits/secured_qm

securing email attachments