Made the command used configurable.
Added docs for command option.
Merge pull request #5 from kokx/feature/config-command

Config screenshot command
Steps towards being more cross-platform

- Made notify command configurable
- Clipboard feature now using pyperclip.py
- Mac support now uses the main ./screenshot script
- Linux/Mac specific sample configs
- Version bumped to 0.2.0
- Updated readme
Initial animated gif support
Update readme about gif support
Update readme and fix path issue for gif recording.
Add mention of LICEcap in readme.
add S3 upload support
Merge pull request #7 from bjyoungblood/feature/s3-uploads

Add S3 upload support