Index and Master view changes

Changed header logo on navbar, changed stripe pop logo image, changed
iPhone slide photos, replaced template video with sliding pandas for
now, edited How it Works section, changed email address under contact
us.
Changed stripe logo
Update to reservation controller - fixed typo
update to migration fixed cost width
fixed cost width and duration name
added timestamp
deletion of old migration
deletion of old migration
created table seeders
new table seeder
new space table seeder
adjusted timestamp to true for new timestamps
fixed date time picker location to div vs input
modified start/global per class instruction
turned on check if reservation exists
Merge pull request #91 from spotfinder/grace

Changes
Merge pull request #90 from spotfinder/karina

Karina
Merge pull request #92 from spotfinder/mike

Mike
change the validation rules for adding a lot, delete a reservation  is working.