Correct missing post instance variable in the docs. (ht: aklein-dex)
Uses LEN when using sqlserver as connection source

SQLServer does not support the LENGTH function, but has the same functionality implemented with LEN.
This change detects if the 'sqlserver' connection adapter is being used, and changes the
function accordingly.
Fix relation code to support Rails 3.2.9.rc1

See issue #332
Bump version and update changelog

[ci skip]
Merge pull request #330 from btrepp/master

Fix LENGTH undefined in microsoft sqlserver
Fix broken TravisCI image
Merge pull request #346 from andyw8/master

Fix broken TravisCI image
Fix tiny typo in readme
Merge pull request #347 from qnm/master

Fix tiny typo in readme
Fix LENGTH undefined in slug history for microsoft sqlserver. fix #330
Merge pull request #350 from linuxonrails/master

fix #330
Fixes #348 Attempt to describe the use of multiple scopes
Merge pull request #351 from qnm/348

Fixes #348 Attempt to describe the use of multiple scopes
Created a fix for a specific special character case.

- When a sluggified string contains chinese or other special characters plus
  a number. It is passed through as just a number which will result in the
  :slug being a number which could match an objects id and causes problems
  when accessing it via model/[:id]
- This is provided you do not have transliterate locals to translate
  the characters to english.
- Fix allows for a random 10 character string to be inserted in place of
  the special characters.