add session_controller_spec
add session routes
add session_controller
update session_controller_spec
update session_controller
add login.html.erb
Merge pull request #31 from Edchen001/session_controller_xiran

Session controller xiran
remove constrain user_id on trips
changed name of climate type type field to name and fixed seed.rb to seed climate types correctly
added missing climates
renamed coordinate model
renamed type field to name
seeding coordinates now works
Merge branch 'climate_seed' of github.com:Edchen001/PackSnap into climate_seed