Merge pull request #1 from goodmaoxixi/master

add scaffold Lan
Ignore *.swp files
Merge scaffold Lan created by Jia Li
Delete architecture/ip_management20141020a.xls as is replaced by ipams-tables20141020a.xls
Correct the one-to-many relationship between table lans & table vlans in the dia file. Create the test dat for table lans in seed.rb
Create controller Welcome & add seeding support.

1. Create controller Welcome with action index to be used as the welcome page
   and the portal.
2. Add table lans test data to seed.rb.
3. Rename application.css to application.css.scss and populate this file and
   welcome.css.scss with code copied from the famous depot example of Pragmatic
   Agile Web Development with Rails.
Add table css in lans.css.scss

Add table cell border formats.