#106: fix css alignment for logout icon and give higher precedence to bootstrap css.
making compatible with all bootstrap themes!
Setting doctype to html5 .
comment for higher precedence to bootstrap and space before logout icon
#149: re-structured the challenge.html template
pass argument for keywork urlsafe
Merge pull request #148 from anubhavsinha/#106

#106: fix css alignment for logout icon
Merge pull request #151 from anubhavsinha/#149-new

#149: re-structured the challenge.html template
Merge pull request #160 from anubhavsinha/#159-take_tour_500_error

pass argument for keywork urlsafe
pdfjs
add font-awesome
Merge pull request #162 from anubhavsinha/#156

add font-awesome
Merge remote-tracking branch 'upstream/master' into own_review