0.0.5

• Add option index.base.0;
• Refactor Collection families

0.0.4

• Finish port of tibble.

0.0.3: Merge pull request #5 from pwwang/dev

• Add stats.weighted_mean
• Allow function to prefer recycling input or output for summarise

0.0.2: Merge pull request #4 from pwwang/dev

• Port verbs and functions from tidyverse/dplyr and test them with original cases

0.0.1

• First release