[Fix bug 855491] Export mentor field in ProfileResource API
[Fix bug 854453] Fix newline format in iCAL description field
Merge pull request #371 from johngian/854453

[Fix bug 854453] Fix newline format in iCAL description field
[fix bug 858545] Update developer environment and documentation.
Merge pull request #380 from glogiotatidis/update-local-instructions

Update developer environment and documentation.
[fix bug 857959] Replaced django forms with happyforms.
Merge pull request #382 from akatsoulas/857959

[fix bug 857959] Replaced django forms with happyforms.
Merge pull request #381 from johngian/855491-mentor-field-api

[Fix bug 855491] Export mentor field in ProfileResource API
[fix bug 848756] Fixed celery deprecation warning.
Merge pull request #385 from akatsoulas/848756

[fix bug 848756] Fixed celery deprecation warning.