Fixed Issue #21 reported by @voltan: duplicated head keywords and description
Changed empty result of navigation registry from false to array() to avoid crash in backend with no-nav module
Create .travis.yml
Refactored title/meta rendering
Improved cache option files
Added Pi\Cache\Storage\Adapter\Filesystem to record file expiration so that TTL is not required any more for reading cache
Fixed route bug in path detection
Added support for Intl extension with intlDateFormatter and NumberFormatter suggested by @voltan in Issue #24
Disable IP validator for Issue #25
Merge pull request #27 from sexnothing/master

Fixed Issue #26
Removed travis temporarily
Fixed Issue #28: cookie is not emptied after logout
Merge remote-tracking branch 'upstream/master'
Improved session validation
Merge remote-tracking branch 'upstream/master'
bug for perm-admin perm-front