Caluma-alexandria

Fix
* **thumbs**: set content-type ([`bb77127`](https://github.com/projectcaluma/alexandria/commit/bb771277c0e72543a54100062be92d46e23448e9))

Feature
* **thumbnails:** Upload thumbnails using upload url ([`aa03128`](https://github.com/projectcaluma/alexandria/commit/aa031285ae6e64adc6f5de6d14f9e8b850ab9d7b))

Feature
* **document:** Add manual document date field ([`4a4fcbe`](https://github.com/projectcaluma/alexandria/commit/4a4fcbe5cfb09a5665f378ab4e7d7ad203655dad))

Feature
* Return documents from child categories ([`b992a3f`](https://github.com/projectcaluma/alexandria/commit/b992a3f1cbc045e6a4bb8eb64c822b0cb3a462e9))
* **document:** Add categories filter ([351](https://github.com/projectcaluma/alexandria/issues/351)) ([`a9cb293`](https://github.com/projectcaluma/alexandria/commit/a9cb293ae5211eae8688e8b15305be011bbd4a74))

Fix
* **zip:** Append number to duplicate file names ([337](https://github.com/projectcaluma/alexandria/issues/337)) ([`8f09c5f`](https://github.com/projectcaluma/alexandria/commit/8f09c5f0c304764a8a71afa451cbe2e9fa76d5fe))

Fix
* **settings:** Fix wrong types of boolean settings ([`80e2564`](https://github.com/projectcaluma/alexandria/commit/80e2564ab10327f8e7339bea325c6b4cb2dffb8c))

Feature
* **category:** Add slug filters for category list ([`23f7d7e`](https://github.com/projectcaluma/alexandria/commit/23f7d7e0bed21953e003d2ec33a1348ff2050525))