happo for npm release notes

Changes:

• You can now use likadan.fdefine to focus on a single example
• Pointer events are now disabled when running the Likadan suite. This will prevent e.g. hover effects from resulting in diffs. (Thanks to @lencioni).

Changelog:

• Round percentages in comparison output to 1 decimal
• Remove "Press Enter to exit..." after running likadan
• Allow .likadan.yaml to contain ERB
• Add likadan upload_diffs command line tool to upload diffs to Amazon S3
• Allow loading a different configuration file (through env variable LIKADAN_CONFIG_FILE)
• Allow configuration of webdriver so that you can try out e.g. :chrome
• Add likadan prune command to recursively remove all snapshots

Improved cropping