bugfix, cache cleaning
Merge pull request #19 from cnlpete/release/3.0

release fixing
Merge pull request #18 from cnlpete/development

[3.1] better smarty pathvariables
Merge pull request #20 from marcoraddatz/master

fixing caching
[bugfix] properly set the header(Content-Type)
Merge branch 'release/3.0' of github.com:cnlpete/candyCMS-Core into release/3.0
Merge pull request #21 from cnlpete/release/3.0

[3.0] proper content-type setting
Merge pull request #22 from marcoraddatz/master

3.0 -> 3.1
added a cache helper and made the I18n helper use it instead of the sessions cache, as there was no way to clear it
added I18n::getPossibleLanguages to list all available languages
added a very basic administration controller, that can clear the cache (usefull when the language files where updated)