Unused directories cleanup.
Updated rspec to 3.0.0.beta2. Also bundle update.
Merge branch 'master' of github.com:cvut/sirius

Conflicts:
	Gemfile.lock
More of bundle-update :-).
Simple Period class for wrapping start-end date tuples.
Support for Period in planners.
A bit more of domain logic implementation - data manipulation with Parallels.
Semester class WIP.