Merge pull request #26 from chamilo/1.9.x

1.9.x
Merge pull request #27 from chamilo/1.9.x

1.9.x
Merge pull request #28 from chamilo/1.9.x

1.9.x
Merge pull request #29 from chamilo/1.9.x

1.9.x
Merge pull request #30 from chamilo/1.9.x

Finished integration of recordings into OpenMeetings plugin - refs BT#70...
Merge pull request #31 from chamilo/1.9.x

1.9.x
Merge pull request #32 from chamilo/1.9.x

1.9.x
Merge pull request #33 from chamilo/1.9.x

1.9.x
Fixing $token in mystudents.php -refs #6930
Indentation
Merge pull request #34 from chamilo/1.9.x

1.9.x
Merge pull request #35 from chamilo/1.9.x

1.9.x
Merge pull request #36 from chamilo/1.9.x

1.9.x
Merge pull request #37 from chamilo/1.9.x

Adding x-sendfile header see #6853
Removing only course relation in active url -refs #6977
Indentation
Using api_is_multiple_url_enabled() -refs #6977
Minor - fixing PHP notice.
Fixing query see BT#7560
Minor - removing whitespaces.