Added pagination (#16)

config.yml.sample

@@ -7,6 +7,8 @@ service:
   interface: ":3456"
   # The URL of the frontend, used to send password reset emails.
   frontendurl: ""
+  # The number of items which gets returned per page
+  pagecount: 50
 
 database:
   # Database type to use. Supported types are mysql and sqlite.
@@ -48,4 +50,4 @@ mailer:
   # Wether to skip verification of the tls certificate on the server
   skiptlsverify: false
   # The default from address when sending emails
-  fromemail: 'mail@vikunja'
+  fromemail: 'mail@vikunja'