Converting files to Unix format

Please, before pushing, use the following commands:

```php
# change access flags
find . -type f -exec chmod 0644 {} \;

# convert files to Unix format (CRLF to LF)
find . -type f -exec dos2unix {} \;
```

or add it to git hooks

**P.S.** @sandeepone If it is possible, add this note to the Wiki for developers