Create new 'controllers' package

[vavilen84]

Create new package "controllers" and create 2 controllers files in it: team.go period.go. Inside controllers we can put handlers like Get() Post() Put() - i think it could be cool.
What do you think about it?

@amdw reply
Splitting the team-related and period-related controllers into separate files sounds reasonable to me if we can make it work. There may be some code shared between those controllers, but we can cross that bridge when we come to it.