update dependencies
move to 4.0.2
move jbuilder to latest
Merge pull request #65 from LukasMac/student_feedback

Student feedback
flip to using non festive logo
update dependencies
don't validate locale
handle both student and coaches attending invites
none should be able to sign up as an admin
automate coaches invitations.
remove puts
this is for people who didn't bother reading the
text on the first page
Merge pull request #68 from despo/coaches-invitations

Coaches invitations
replace hardcoded session name with variable 
:smile:
show latest sessions first
fixes #58 and adds sponsoring page
also set paragraph font size to 18px
Merge pull request #69 from despo/small-fixes

Fix sponsors and add sponsoring page
fix spacing in support us header
reduce sponsorship page list font
Suggestions for the sponsorship wording