Use the new build env on Travis

more ram and cpu, improved network and boot times

http://docs.travis-ci.com/user/workers/container-based-infrastructure/

more docs coming soon
User Guide update - Database Forge

Made section levels consistent with the other database reference docs.
Added return value writeups.
Signed-off-by:James L Parry <jim_parry@bcit.ca>
User Guide update - Datbase Utilities

1) Updated TOC structure of the DB Utilities writeup
2) Added a class reference at the end, ordered by method name
Signed-off-by:James L Parry <jim_parry@bcit.ca>
User Guide update - Datbase Utilities

1) Updated TOC structure of the DB Utilities writeup
2) Added a class reference at the end, ordered by method name
Signed-off-by:James L Parry <jim_parry@bcit.ca>
User Guide update - Datbase Utilities

Fixed the return types
Signed-off-by:James L Parry <jim_parry@bcit.ca>
Fix the user guide writeup for the DB forge
Signed-off-by:James L Parry <jim_parry@bcit.ca>
Merge pull request #3375 from jim-parry/userguide/dbforge

User Guide update - Database Forge
Merge branch 'develop' of github.com:bcit-ci/CodeIgniter into userguide/database_utilities
Merge pull request #3378 from jim-parry/userguide/database_utilities

User Guide update - Database Utilities
add querystring to page caching. #2349
add querystring to page caching. #2349
Fixed code style. Update changelog. #2349
Remove duplicated method in database utilities documentation
Merge pull request #3385 from aanbar/remove_duplicates

Remove duplicated method in database utilities documentation
Merge pull request #3372 from joshk/patch-1

Use the new build env on Travis
Merge pull request #3384 from ster/develop

issue #2349 : Page caching with querystring
Some polishing following PR #3384
Another correction following #3384