Change mitx.db to edx.db for dev sqlite
update LocMemCache location to use edx instead of mitx
Merge pull request #1879 from edx/db/mitx-edx-sqlite

Change mitx.db to edx.db for dev sqlite
Merge pull request #1880 from edx/db/mitx-edx-locmem

update LocMemCache location to use edx instead of mitx
On export error, handle quotes within string.

STUD-1013
Merge pull request #1869 from edx/christina/export-error

On export error, handle quotes within string.
Update handler_url support to match the latest in the xblock repo, for both js and python runtimes
Run tests in lms/lib and cms/lib