Bump bundled less.js to 1.3.3
Fixing tests: duplicate styles are removed and IE filters are properly capitalized now
Update README.md
Merge pull request #17 from rlaw/less_1_3_3_upgrade

#17 less 1.3.3 upgrade
bumped up pom version to 1.3.3-snapshot to match official lesscss version
#22 Single or Double Quotes around imports
[maven-release-plugin] prepare release lesscss-1.3.3
* Upgraded to lesscss-1.3.3
* Created JarURLResolver to allow resolution of less files inside a jar

and:

Merge commit '579cfa92b01e10deebffb0acb17ecd6efdf26699'

Conflicts:
	pom.xml
	src/main/java/org/lesscss/LessSource.java