photon 0.3.5

• Set limit = 1 as default (#2)
• Increment photon version number
• Document lang = "default" (#8)
• Allow osm_tags and layer arguments to take vectors of length > 1 (#7)
• Fix typos and old info in documentation (#4)
• Add current date to metadata if search index is tagged as "latest" (#5)
• Fix typo in range assertion (#9)
• Add details to HTTP error messages (#6)
• Improve performance by querying duplicates only once (#10)
• Always keep number of rows from original dataset (#3)
• Fix broken ps command on newer Linux versions
• Made setups more stable by splitting logs (#11, #12)
• Handle NA as argument input more elegantly
• Added optional latinization
• Renamed consent argument of purge_java() to ask