Merge pull request #23 from jmontoyaa/1.9.x

Updating chamilo logo see #6094
Merge pull request #24 from jmontoyaa/1.9.x

Updating lang vars + changing from MailMarkSelectedAsUnRead to MailMarkS...
Merge pull request #25 from jmontoyaa/1.9.x

Fixing php warning see #6122
Gradebook order
fixing recommendations #6015
Minor - Removed arguably useless comment
Minor - Fixed language var
Fixed style for Win7 - refs #5410
Merge pull request #26 from ycastillo/yoselyn.puntuacion

Gradebook order - refs #5969
Merge branch 'ycastillo-yoselyn.social' into 1.9.x - refs #6015
Merge branch '1.9.x' of github.com:chamilo/chamilo-lms into 1.9.x - refs #6015
Fixed db name error in 1.8.7 to 1.8.8 migration - reported and fixed by Kevin Levron - closes #5998
Removed all references to Glyphicons from Bootstrap CSS for obtrusive licensing terms - refs #6049
Fixed different visiblities of folders in documents - refs #5555
Minor - Code spacing
#5855
#5855
#5855
profile updated #6127
css changes in 6134