allow different regions for S3 buckets
add AWS_REGION env var. trim whitespace
README code formatting
update Task generator to create an engine
fix generator-mountable and skip-unit-test flags
add rake task to create custom Task card in Tahi

run with: rake custom_cards:install[‘Visualize’]
Merge branch 'master' into heroku-modifications
Merge branch 'master' into feature/generate-task-as-gemmable-engine
Merge branch 'master' into heroku-modifications
Merge branch 'heroku-modifications' of github.com:Tahi-project/tahi into heroku-modifications
Merge branch 'master' into feature/generate-task-as-gemmable-engine
Merge branch 'feature/generate-task-as-gemmable-engine' of github.com:Tahi-project/tahi into feature/generate-task-as-gemmable-engine
Merge pull request #443 from Tahi-project/feature/generate-task-as-gemmable-engine

Feature/generate task as gemmable engine
move basic http auth to env variables [#79733996]
Update README
Merge pull request #450 from Tahi-project/update-readme

Update README
Merge pull request #449 from Tahi-project/env-basic-http-auth

move basic http auth to env variables [#79733996]
[#79407366] Update nav bar and control bar designs
Merge pull request #453 from Tahi-project/navigation-style-changes

[#79407366] Update nav bar and control bar designs
Session background image fixen