Update .htaccess

If site don't work without "index.php" in URL, need add this string.
Added Turkish language files
Added swedish language support
Fixed typo in english language file
Add $attributes param to asset function

This commit adds a second parameter $attributes to the following functions:

- AssetMaker::addJs
- AssetMaker::addCss
- AssetMaker::addRss

This is useful when dealing with javascript libraries like require.js, which depend on these HTML attributes to function properly.

It does not break the existing code!
Update README.md

Adjust Laravel link so it works
Added German language files
Change demo page routes to /demo/{page}
Moved hard-coded text to language file (backend)

Hard-coded text from the backend (user- and group management) moved to
the language file (English and Dutch).
Add further translation files
Add brazilian portuguese translation to backend.
Updated Backend + System language support

Moved hard-coded text in "backend" and "system" to the language files
(English and Dutch). Affected pages: administrator management,
administrator group management, system updates, system settings, email
settings. Also made some strings more generic for general use (like
"Saving...." instead of "Saving administrator account...")
Minor fixes
Updated CMS language support

Moved hard-coded text in "cms" to the language files (English and
Dutch). And some minor changes.
Add licence to readme
Merge pull request #71 from RomanGorbatko/patch-1

Update .htaccess
Add helpful RewriteBase comment to .htaccess
Merge pull request #85 from emir/master

Added Turkish language files
Merge pull request #96 from pariz/master

Swedish language files for backend, cms and system, as well as one typo if in an english language file
Merge pull request #98 from alxy/patch-1

Add $attributes param to asset function