Multiple performance updates
- Angular and translation update #255
- reduced client code app size from 4.5MB to 3.3MB
- significantly improved release build time
- Map can now handle 1000+ photos #256
- Improved search performance #298
- Improved search behavior #309
- search returns with directories too (by default switched off in config) #304
- Downloading zipped directory, kudos to @mcdamo #52
- non expiring sharing links #260
- polish translation, kudos to @gklebus #283
Multiple bug fixes
see all resolved issues at https://github.com/bpatrik/pigallery2/milestone/4