v0.10.81

Franklin v0.10.81

Diff since v0.10.80

Closed issues:

• Gallery generation? (#979)
• Allow code highlighting for more languages (#997)
• check_ping always fails (#1004)
• wrong sitemap for keep_path (#1008)

Merged pull requests:

• add ttl argument to check_ping (#1005) (@yakir12)
• Add demo to render Dataframe as HTML table (#1006) (@theogf)
• closes 1008, url_curpage should check keep_path (#1009) (@tlienart)