Merge pull request #15 from Eric-Guo/master

Improvement when using railscasts-china to build internal cast site
Switch to using Oracle DB for development and test.
Make the REGEXP pass in Oracle DB.

http://stackoverflow.com/questions/1031844/oracle-db-how-can-i-write-query-ignoring-case
do not running travis CI on cast branch since it's Oracle DB based.
remove social media link.
Using ominiauth-ldap instead of github.
Now can login via windows account.
fix session rspec test.
No need Google Analytics
remove sponsor links
remove linode links
using cast branch to deploy, so we can merge back to official branch if need.
should be uploads
Change logo.
Set password at Environment Variable.
change footer.
Get mes service password from environment variable.