add support amazon silk support for kindle devices
add building instructions
closes #16 - move commonjs to first check
0.3.5
Merge branch 'amazon_silk' of github.com:smtlaissezfaire/bowser into smtlaissezfaire-amazon_silk

Conflicts:
	bowser.min.js
0.3.6
closes #35 - making silk not part of safari detection
0.3.7
fix README formatting
Merge pull request #38 from smtlaissezfaire/amazon_silk

fix README formatting