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Update pi-day-release.txt
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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