[TASK] Update Travis build script

Conflicts:
	.travis.yml
[TASK] Coding guidelines cleanup
[FEATURE] Add carousel autostart

As requested in #97
[TASK] Add LLL for carousel autostart field
Merge pull request #98 from cedricziel/autostartSlider

[FEATURE] Add carousel autostart
[TASK] Sanitise well/responsive settings for Row element
[BUGFIX] Add missing translation label
[TASK] Fix width percentage display
[TASK] Update remotes in Travis build script

...and remove temporary Git install.
Merge branch 'refs/heads/development' into staging

Conflicts:
	.travis.yml
	class.ext_update.php
[TER] 3.0.0
[TASK] Set version to 3.1.0 beta