Merge branch 'ESSENTIAL_26'

Conflicts:
config.php
layout/frontpage.php
renderers/core_renderer.php
settings.php
style/essential.css
style/settings.css
Fixes after bad merge
Fixes and corrections for Font Awesome 4.0.
Correction.
Fix Moodle 2.6 upgrade as per https://moodle.org/mod/forum/discuss.php?d=243679#p1057801.
Merge pull request #85 from gjb2048/master

Corrections
Updating version number
fix call for browser check
Removing line left for testing
removing third design as not needed yet
Updating version number and minimum requirements
New settings to change slideshow text colors
updating version number
Updated readme
Applying new color options to slides
Moving frontpage content back to the correct location
Update theme_essential.php
fontselect translate
Merge pull request #87 from felixod/patch-25

fontselect translate
Merge pull request #86 from felixod/patch-24

Update theme_essential.php