Moccasin App: navigation splash page, singin, signup, signout

Created views files for signin, signup, signout that stem from the splash/welcome page
Moccasin App: navigation modifications to views

modified views files to display welcome screen
Moccasin App: troubleshooting

fixed the name of steps.rb => step.rb, modified steps controller and views
Moccasin App: modifications to activities views and controllers

made modifications to activities controller and views
Moccasin App: navigation in activities views/controller, steps views/controller, welcome views/controller

Modified controller and views files for steps, activities, welcome in order to allow the creation of new steps within the activities
Moccasin App: modifications for navigation

modified views pages to make a proper navigation
Moccasin App: display all activities page added

added new method in activities controller that makes it possible to show all the activities created by all users in an acitivitiesall.html.erb page in views
Moccasin App: modifications for navigation

modified views files for better navigation
Merge pull request #4 from crowhead/navigation

Navigation