New activity page
Store new activity to DB
View for showing the activity which was just created
View for showing the activity which was just created
Spec for testing the new_person_activity page

check if the form for writing a tweet can be displayed properly, and
then check if the submitted data can be saved into database successfully
Merge branch 'issue-5' of github.com:nedap/internal-tweeter into issue-5
Merge branch 'issue-4' into issue-5
Merge branch 'master' into issue-5
Made some styling changes
Use links instead of buttons to go to other pages
Unneeded, on create we redirect to the activity or render new
Show errors when an activity cannot be created
Add feature that confirms errors are displayed when activity content isn't filled out
Merge branch 'issue-5' of github.com:nedap/internal-tweeter into issue-5