removed t and f 's from group model

removed t and f 's from user model as mentioned in #919
removed t and f 's from group model

removed t and f 's from user model as mentioned in #919

removed t's and f's from category model
merged postgres improvements
keep French localization up to date

:fr:
remove hardcoded value and replace with SiteSetting.cas_domainname
refactored and tested AvatarLookup

less array copying

Avoid N queries
Don't append the base url to absolute image urls without protocol.
Extract InviteRedeemer from Invite
Refactored two class methods into scopes (to achieve a better 'rails way')
Also added some tests to the methods
Merge remote-tracking branch 'upstream/master'
added more file uploads test for better coverage
Merge pull request #901 from xtream/master

Refactored AvatarLookup
Merge pull request #928 from jd-erreape/master

Refactored some class methods to scopes in order to achieve a better 'Rails way'
Merge pull request #926 from netzpirat/fix-s3-images

Don't append the base url to absolute image urls without protocol.
Merge pull request #922 from ZogStriP/keep-french-l10n-up-to-date-2013-05-29

[ci-skip] keep French localization up to date
Merge pull request #931 from ZogStriP/more-file-upload-test-coverage

added more file uploads test for better coverage
Merge pull request #921 from nirnanaaa/postgres-truefalse

removed t's and f's from models
Merge pull request #923 from eriko/cas_support

remove hardcoded value and replace with SiteSetting.cas_domainname
file is uploaded but hash is not matching ... why?
allow eviction of computer help for @geek