Merge pull request #634 from jmmendivil/1.8/develop

Changed default bool parameters to true to reflect the method syntax
Fix typo
documented missing password config value; closes fuel/core#1674
Made overwrite and before_update clean

I cannot make it cleaner
Fix typo
Merge pull request #636 from kenjis/fix_auth

Fix typo
Add example of cache section
Merge pull request #637 from kenjis/fix_cache

Add example of cache section
Merge pull request #635 from kenjis/fix_typo

Fix typo
Merge pull request #627 from sagikazarmark/1.8/develop

Added docs for slug overwrite
Added the rollback_all paremeter into DB::rollback_transaction()
Merge pull request #638 from ose1955/1.8/develop

Nested transactions - rollback_all
documented --testsuite switch; related fuel/oil#228
corrected Mongo_Db like() docs; related fuel/core#1672
documented the new to_csv() $headings argument; related fuel/core#1611
Documented list_collections(); related fuel/core#1675
documented match_collection; related fuel/core#1655
documented the optional parameter for CSV format parsing; related fuel/core#1630
documented native session emulation
Add smtp.starttls config.

See https://github.com/fuel/email/issues/55