Updated README.md to include instructions for installation on Ubuntu/Debian Linux.
1. Added cd into cloned directory.
2. Add push to remote origin as part of submitting a patch
Fix bounds check for mousemove events.

Closes #369
Merge pull request #381 from bmacnaughton/README.md-update

Readme.md update
Simplify Debian/Ubuntu instructions a bit.
Some more streamlining of README instructions.
Remove internal clamping of color values to facilitate proper mathematical calculations with colors.

Clamp only when producing CSS values. Closes #271.
Fix scoping issues in PaperScript code.
Implement Color component clamping for color conversion.
Implement a better way of handling exceptions in PaperScript on Firefox and Chrome.

Use dynamically inserted script tag rather than compiled function since Firefox reports correct line numbers there.
Only include the global handlers in the return statement that actually seem to be defined.
Only expose globals if they are in use in the PaperScript code.
Merge git://github.com/paperjs/paper.js