Url/year/title

Change pdf endpoint to pdf/year/title with title having its white spaces removed and transformed to . to accomodate regex search

added 4 commits

• 03274cca...9ccb0181 - 3 commits from branch master
• d9a3dfd4 - Merge branch 'master' into 'url/year/title'

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merged

mentioned in commit 60f84e30