Reset state if invalid version and constraint
Add constraint validation
Merge pull request #17 from mfillon/reset-state-valid-constraint

Reset state + valid constraint
Add contributors link
Handle error without interruptin gulp watch

- JS/JSX syntax error caused gulp to crash during a watch. Fix that by adding on("error",...) in browserify bundle phase
- Add gulp-notify to get system notification on error
Merge pull request #19 from mfillon/continue-watch-on-error

Handle error without interrupting gulp watch
Add link to article in warnings
Fix explain messages
Be responsive
Add composer warning for caret-range
Add composer explain
Refactor ranges
Add link to composer website