bug: characters translation

http://cn2.php.net/manual/en/function.strtr.php
Merge pull request #3569 from jmxhit/patch-1

bug: characters translation
CHANGELOG for #3569
Update CGridView.php

Added a seam to override only a data cell rendering process, without the need to override the whole `CGridView.renderTableRow()`.
Marked the change to CGridView.renderDataCell() from c8969e543bdf0075f895ff92d460b5a2af4e9aa1 as introduced in version 1.1.17
re #3571
Merge pull request #3571 from hijarian/patch-1

Update CGridView.php
Update CHANGELOG
Added Gitter badge
Merge pull request #3577 from gitter-badger/gitter-badge-1

Add a Gitter chat badge to README.md
Update README.md
fix English typos in `UPGRADE` file
Fixes #3584: Incorrect constructor in CHtmlTestModel
Merge pull request #3586 from GerHobbelt/fix-typos-3586

[skip ci] fix English typos in `UPGRADE` file
Removed broken unused code from test
ensure `build autoload` has the same output on windows and unix

- make sure `build autoload` produces the same output on both Windows and Unix platforms (findFiles() turns out to produce a mix of \ and / delimited paths which corrupts the sort order on Windows)

- run `build autoload` to verify that the patch works.

close #3582, close #3583
Missing translation (italian)

It seems that in messages/it/yii.php the translation of '{attribute} must be {value}.' is missing.
Actually the entire element is missing, key and value.
Merge pull request #3591 from masiorama/patch-1

[skip ci] Missing translation (italian)
Fixes typo in docblock
Merge pull request #3594 from mpestov/typo

[skip ci] Fixes typo in docblock
bump `@since` version number for 1.1.15

they are in 1.1.16 now because 1.1.15 was a security release